Different ISRC or masters (not) sharing the same recordings

If you look at this conversation I just had:

The mastering process creates a very different looking fingerprint. Since editors reject merges based on fingerprints, there seems to be a direct conflict here. If a fingerprint mismatch is reason not to merge, then a master is a reason not to merge.

So basically, you are telling me that a fingerprint is not to be a factor in the merge or non merge of recordings?