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The two are irrelevant. The dumpfiles used by expdp and impdp doesn't have anything to do with the tablespaces or the tablespace remapping.
A.dmp, B.dmp, and C.dmp must be from the same data pump export meaning you have three either because you exported with PARALLEL=3 or because you exported with FILESIZE=<something> and A.dmp and B.dmp reached that size.