@george1421 i meant to reply to this a long time ago, but here goes.
testing on deduping of those images has been done. they dedup quite well. the dedup changes affect zstd and pigz compressed images. pigz compressed images actually dedup better, but the the compression and performance are worse. it’s a tradeoff to be evaluated by the individual.
dedup is only possible with the newer version of partclone due to a rolling checksum integraed into the image format on earlier versions. the newer version lets us choose no checksum.
the compressed binary file is dedupable thanks to the --rsyncable flag on compression that is supported by both pigz and zstd.
like george said, any deduping would be the responsibility of the underlying filesystem or storage, not built into fog itself.