Here are two docs with the same primary docidentifier. The sources are in slightly different directories (one has -v1 and the other one -v1.1), but directory names are not relevant. However, docidentifiers are relevant.
Primary docidentifier is not expected to be shared by two published documents, even if they are versions of the “same” document. IETF identifiers handle this with numerical suffixes like -00, -01.

Here are two docs with the same primary docidentifier. The sources are in slightly different directories (one has -v1 and the other one -v1.1), but directory names are not relevant. However, docidentifiers are relevant.
Primary docidentifier is not expected to be shared by two published documents, even if they are versions of the “same” document. IETF identifiers handle this with numerical suffixes like -00, -01.