In order to brand an oil as Dexron or Mercon, it has to meet the minimum specs for those products. If a fluid happens to meet the specs for both, then it can be marketed as both. I suspect the viscosity requirements for Dexron and Mercon are close enough that it's possible to meet both specs with a single oil. Then it becomes a matter of using additives such as friction modifiers to meet the other requirements.
Back in the seventies, the specs for the original Dexron and Ford Type F were quite different, as were the transmission designs of the two manufacturers. These days, Ford and GM actually collaborate on transmission designs, so it's only natural that their transmission fluid specs would be very similar.
As for synthetic gear oil in the differential, GM specifies the use of synthetic gear lube in its locking differentials, rather than using friction modifiers and frequent oil changes as in the past. Definitely use synthetic if you have a locking rear end, and it sure can't hurt to put it in a non-limited slip differential.
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