@jpmens shouldn't rsync's --checksum provide this functionality?
@jpmens what does "identical" mean exactly? Right now you only check that "all files in the first set have the same checksum in the second set". Not metadata (timestamps), permissions, or the presence of additional files in the second set. If that's sufficient, I think you're good.
@jpmens I've done similar before and am not aware of a better way. You could try a cheaper checksum (MD5 or worse) to speed it up, if you were happy with that.
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@jpmens https://blog.koehntopp.info/2019/11/11/filling-disk-space-fast.html
It is useful to get fluent with it, because fpart + parallel = easy parallel action in shell with many files.
@jpmens if it’s on *BSD or macOS mtree(8) can do that