Diff of the two buildlogs:

--
--- b1/build.log	2020-03-11 16:15:17.120266416 +0000
+++ b2/build.log	2020-03-11 16:22:54.703404528 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Apr 13 10:37:52 -12 2021
-I: pbuilder-time-stamp: 1618353472
+I: Current time: Thu Mar 12 06:15:24 +14 2020
+I: pbuilder-time-stamp: 1583943324
 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 Mon Oct 30 17:27:26 2017 -12
+gpgv: Signature made Tue Oct 31 19:27:26 2017 +14
 gpgv:                using RSA key 2A7974AE2FC152D77867DA4ACE1F9C674512C22A
 gpgv: Can't check signature: No public key
 dpkg-source: warning: failed to verify signature on ./node-grunt-babel_7.0.0-3.dsc
@@ -29,6 +29,18 @@
 dpkg-source: info: applying use-global-tasks.patch
 I: using fakeroot in build.
 I: Installing the build-deps
+I: user script /srv/workspace/pbuilder/11695/tmp/hooks/D01_modify_environment starting
+disorder-fs debug: Running on profitbricks-build12-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/11695/tmp/hooks/D01_modify_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -333,7 +345,7 @@
 Get: 251 http://deb.debian.org/debian buster/main i386 node-tap all 12.0.1+ds-1 [42.9 kB]
 Get: 252 http://deb.debian.org/debian buster/main i386 nodeunit all 0.11.2+ds3-2 [29.0 kB]
 Get: 253 http://deb.debian.org/debian buster/main i386 node-grunt-contrib-nodeunit all 1.0.0-1 [8406 B]
-Fetched 31.6 MB in 1s (39.2 MB/s)
+Fetched 31.6 MB in 1min 54s (278 kB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libbsd0:i386.
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(Reading database ... 19231 files and directories currently installed.)
@@ -1369,7 +1381,7 @@
 fakeroot is already the newest version (1.23-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/node-grunt-babel-7.0.0/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b
+I: Running cd /build/node-grunt-babel-7.0.0/ && 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 node-grunt-babel
 dpkg-buildpackage: info: source version 7.0.0-3
 dpkg-buildpackage: info: source distribution unstable
@@ -1404,7 +1416,7 @@
 
 Running "nodeunit:tasks" (nodeunit) task
 Testing test.js.OK
->> 4 assertions passed (7ms)
+>> 4 assertions passed (10ms)
 
 Running "clean:test" (clean) task
 >> 3 paths cleaned.
@@ -1468,12 +1480,14 @@
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/11695/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/11695/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/20193 and its subdirectories
-I: Current time: Tue Apr 13 10:38:14 -12 2021
-I: pbuilder-time-stamp: 1618353494
+I: removing directory /srv/workspace/pbuilder/11695 and its subdirectories
+I: Current time: Thu Mar 12 06:22:54 +14 2020
+I: pbuilder-time-stamp: 1583943774