I can't think of why a modification would call to only edit one of them unless the modification only made use of one of them. I wouldn't be surprised though if the modification said "edit the postbit template" but what they really meant was "edit the postbit template and/or the postbit_legacy template depending on which you use."
And, you asked what the difference was? One has the user information on the top (postbit) and one has the user information on the left site (postbit_legacy).
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