Diff of the two buildlogs:

--
--- b1/build.log	2020-05-10 09:53:00.619227877 +0000
+++ b2/build.log	2020-05-10 09:57:19.626071066 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Jun 12 04:15:38 -12 2021
-I: pbuilder-time-stamp: 1623514538
+I: Current time: Sun May 10 23:53:02 +14 2020
+I: pbuilder-time-stamp: 1589104382
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/buster-reproducible-base.tgz]
 I: copying local configuration
@@ -18,7 +18,7 @@
 I: Extracting source
 gpgv: unknown type of key resource 'trustedkeys.kbx'
 gpgv: keyblock resource '/root/.gnupg/trustedkeys.kbx': General error
-gpgv: Signature made Fri Dec 21 08:07:09 2018 -12
+gpgv: Signature made Sat Dec 22 10:07:09 2018 +14
 gpgv:                using RSA key 30B23C8B4E6A3B09EAA6B65212973B6E72DC07B5
 gpgv: Can't check signature: No public key
 dpkg-source: warning: failed to verify signature on ./libmarc-transform-perl_0.003007-1.dsc
@@ -30,6 +30,18 @@
 dpkg-source: info: applying spelling.patch
 I: Not using root during the build.
 I: Installing the build-deps
+I: user script /srv/workspace/pbuilder/18295/tmp/hooks/D01_modify_environment starting
+debug: Running on profitbricks-build2-i386.
+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
+Removing 'diversion of /bin/sh to /bin/sh.distrib by dash'
+Adding 'diversion of /bin/sh to /bin/sh.distrib by bash'
+Removing 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by dash'
+Adding 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by bash'
+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/18295/tmp/hooks/D01_modify_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -107,7 +119,7 @@
 Get: 34 http://deb.debian.org/debian buster/main i386 libmarc-record-perl all 2.0.7-1 [91.1 kB]
 Get: 35 http://deb.debian.org/debian buster/main i386 libmodule-build-perl all 0.422400-1 [259 kB]
 Get: 36 http://deb.debian.org/debian buster/main i386 libyaml-perl all 1.27-1 [66.8 kB]
-Fetched 19.8 MB in 2s (8972 kB/s)
+Fetched 19.8 MB in 6s (3365 kB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libbsd0:i386.
 (Reading database ... 
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(Reading database ... 19234 files and directories currently installed.)
@@ -271,7 +283,7 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/libmarc-transform-perl-0.003007/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b
+I: Running cd /build/libmarc-transform-perl-0.003007/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b
 dpkg-buildpackage: info: source package libmarc-transform-perl
 dpkg-buildpackage: info: source version 0.003007-1
 dpkg-buildpackage: info: source distribution unstable
@@ -326,7 +338,7 @@
 1..28
 ok
 All tests successful.
-Files=1, Tests=28,  0 wallclock secs ( 0.02 usr  0.00 sys +  0.20 cusr  0.00 csys =  0.22 CPU)
+Files=1, Tests=28,  0 wallclock secs ( 0.02 usr  0.01 sys +  0.28 cusr  0.01 csys =  0.32 CPU)
 Result: PASS
    create-stamp debian/debhelper-build-stamp
    dh_testroot
@@ -357,12 +369,14 @@
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/18295/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/18295/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/13975 and its subdirectories
-I: Current time: Sat Jun 12 04:16:00 -12 2021
-I: pbuilder-time-stamp: 1623514560
+I: removing directory /srv/workspace/pbuilder/18295 and its subdirectories
+I: Current time: Sun May 10 23:57:19 +14 2020
+I: pbuilder-time-stamp: 1589104639