hi, https://wiki.debian.org/DpkgConffileHandling suggests that that should be doable using dpkg conffile checksums, e.g.
% dpkg-query -W -f='${Conffiles}' apt-cacher-ng
/etc/apt-cacher-ng/acng.conf 87897bc5b2bbb83614d1ef5e57b57abc
/etc/apt-cacher-ng/security.conf e6cc84b92032492d92d2f723a6a0a63d
/etc/avahi/services/apt-cacher-ng.service f9a20231fdcd52a6fbf8ffbf3656aa78
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