Diff of the two buildlogs:

--
--- b1/build.log	2023-04-07 16:50:54.318547995 +0000
+++ b2/build.log	2023-04-07 16:52:15.011867717 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu May  9 11:12:47 -12 2024
-I: pbuilder-time-stamp: 1715296367
+I: Current time: Sat Apr  8 06:50:58 +14 2023
+I: pbuilder-time-stamp: 1680886258
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bookworm-reproducible-base.tgz]
 I: copying local configuration
@@ -16,7 +16,7 @@
 I: copying [./rust-rgb_0.8.36.orig.tar.gz]
 I: copying [./rust-rgb_0.8.36-1.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Thu Mar 16 14:05:02 2023 -12
+gpgv: Signature made Fri Mar 17 16:05:02 2023 +14
 gpgv:                using RSA key 5340D001360CA656E3497EB70C48EA2A7A8FFD7B
 gpgv:                issuer "plugwash@debian.org"
 gpgv: Can't check signature: No public key
@@ -28,11 +28,20 @@
 dpkg-source: info: applying fix-tests-argb-only.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/4729/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/31591/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink10-arm64.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+lrwxrwxrwx 1 root root 4 Jan  6 03:20 /bin/sh -> dash
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/31591/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/31591/tmp/hooks/D02_print_environment starting
 I: set
   BUILDDIR='/build'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME='pbuilder2'
   BUILD_ARCH='arm64'
   DEBIAN_FRONTEND='noninteractive'
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=8'
@@ -42,38 +51,38 @@
   IFS=' 	
   '
   LANG='C'
-  LANGUAGE='en_US:en'
+  LANGUAGE='nl_BE:nl'
   LC_ALL='C'
   MAIL='/var/mail/root'
   OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
+  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path'
   PBCURRENTCOMMANDLINEOPERATION='build'
   PBUILDER_OPERATION='build'
   PBUILDER_PKGDATADIR='/usr/share/pbuilder'
   PBUILDER_PKGLIBDIR='/usr/lib/pbuilder'
   PBUILDER_SYSCONFDIR='/etc'
-  PPID='4729'
+  PPID='31591'
   PS1='# '
   PS2='> '
   PS4='+ '
   PWD='/'
   SHELL='/bin/bash'
   SHLVL='2'
-  SUDO_COMMAND='/usr/bin/timeout -k 18.1h 18h /usr/bin/ionice -c 3 /usr/bin/nice /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.d8Gmv5P8/pbuilderrc_JPBX --distribution bookworm --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.d8Gmv5P8/b1 --logfile b1/build.log rust-rgb_0.8.36-1.dsc'
+  SUDO_COMMAND='/usr/bin/timeout -k 24.1h 24h /usr/bin/ionice -c 3 /usr/bin/nice -n 11 /usr/bin/unshare --uts -- /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.d8Gmv5P8/pbuilderrc_SnZR --distribution bookworm --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.d8Gmv5P8/b2 --logfile b2/build.log --extrapackages usrmerge rust-rgb_0.8.36-1.dsc'
   SUDO_GID='117'
   SUDO_UID='110'
   SUDO_USER='jenkins'
   TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
+  TZ='/usr/share/zoneinfo/Etc/GMT-14'
   USER='root'
   USERNAME='root'
   _='/usr/bin/systemd-run'
   http_proxy='http://192.168.101.16:3128'
 I: uname -a
-  Linux codethink11-arm64 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May  9 04:48 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/4729/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr  6 00:25 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/31591/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -182,7 +191,7 @@
 Get: 63 http://deb.debian.org/debian bookworm/main arm64 debhelper all 13.11.4 [942 kB]
 Get: 64 http://deb.debian.org/debian bookworm/main arm64 dh-cargo all 30 [10.3 kB]
 Get: 65 http://deb.debian.org/debian bookworm/main arm64 librust-bytemuck-dev arm64 1.12.1-1 [40.8 kB]
-Fetched 107 MB in 5s (21.0 MB/s)
+Fetched 107 MB in 2s (51.0 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libpython3.11-minimal:arm64.
 (Reading database ... 
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(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19616 files and directories currently installed.)
@@ -458,8 +467,17 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+usrmerge is already the newest version (35).
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/rust-rgb-0.8.36/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-genchanges -S  > ../rust-rgb_0.8.36-1_source.changes
+I: user script /srv/workspace/pbuilder/31591/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/31591/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/rust-rgb-0.8.36/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-genchanges -S  > ../rust-rgb_0.8.36-1_source.changes
 dpkg-buildpackage: info: source package rust-rgb
 dpkg-buildpackage: info: source version 0.8.36-1
 dpkg-buildpackage: info: source distribution unstable
@@ -492,7 +510,7 @@
    Compiling rgb v0.8.36 (/build/rust-rgb-0.8.36)
      Running `CARGO=/usr/bin/cargo CARGO_CRATE_NAME=rgb CARGO_MANIFEST_DIR=/build/rust-rgb-0.8.36 CARGO_PKG_AUTHORS='Kornel LesiƄski <kornel@geekhood.net>' CARGO_PKG_DESCRIPTION='`struct RGB/RGBA/etc.` for sharing pixels between crates + convenience methods for color manipulation.
 Allows no-copy high-level interoperability. Also adds common convenience methods and implements standard Rust traits to make `RGB`/`RGBA` pixels and slices first-class Rust objects.' CARGO_PKG_HOMEPAGE='https://lib.rs/crates/rgb' CARGO_PKG_LICENSE=MIT CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=rgb CARGO_PKG_REPOSITORY='https://github.com/kornelski/rust-rgb' CARGO_PKG_RUST_VERSION='' CARGO_PKG_VERSION=0.8.36 CARGO_PKG_VERSION_MAJOR=0 CARGO_PKG_VERSION_MINOR=8 CARGO_PKG_VERSION_PATCH=36 CARGO_PKG_VERSION_PRE='' CARGO_PRIMARY_PACKAGE=1 LD_LIBRARY_PATH='/build/rust-rgb-0.8.36/target/debug/deps:/usr/lib' rustc --crate-name rgb --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="as-bytes"' --cfg 'feature="bytemuck"' --cfg 'feature="default"' -C metadata=661589d9fdfc62f0 -C extra-filename=-661589d9fdfc62f0 --out-dir /build/rust-rgb-0.8.36/target/aarch64-unknown-linux-gnu/debug/deps --target aarch64-unknown-linux-gnu -C incremental=/build/rust-rgb-0.8.36/target/aarch64-unknown-linux-gnu/debug/incremental -L dependency=/build/rust-rgb-0.8.36/target/aarch64-unknown-linux-gnu/debug/deps -L dependency=/build/rust-rgb-0.8.36/target/debug/deps --extern bytemuck=/build/rust-rgb-0.8.36/target/aarch64-unknown-linux-gnu/debug/deps/libbytemuck-aef0d1d01c4afdd9.rmeta -C debuginfo=2 --cap-lints warn -C linker=aarch64-linux-gnu-gcc -C link-arg=-Wl,-z,relro --remap-path-prefix /build/rust-rgb-0.8.36=/usr/share/cargo/registry/rgb-0.8.36 --remap-path-prefix /build/rust-rgb-0.8.36/debian/cargo_registry=/usr/share/cargo/registry`
-    Finished dev [unoptimized + debuginfo] target(s) in 3.16s
+    Finished dev [unoptimized + debuginfo] target(s) in 3.57s
 librust-bytemuck-dev:arm64 1.12.1-1 0
 rustc 1.63.0+dfsg1-2 1
    create-stamp debian/debhelper-build-stamp
@@ -525,12 +543,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: including full source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/31591/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/31591/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/4729 and its subdirectories
-I: Current time: Thu May  9 11:13:53 -12 2024
-I: pbuilder-time-stamp: 1715296433
+I: removing directory /srv/workspace/pbuilder/31591 and its subdirectories
+I: Current time: Sat Apr  8 06:52:13 +14 2023
+I: pbuilder-time-stamp: 1680886333