cbwjm
Seb-wejem
I'm actually going to be smushing a number of different eras together. Greek/Roman gods, Egyptian gods, savage elves worshipping the Celtic gods, Sumerian and Babylonian gods vying for control, Norse gods in the north next to the gods of the Rus.Outside of a few players who might be super deep into either pantheon (or both), most players will likely not be able to distinguish one from the other. For ease of use it would probably be better to merge them while making a few choices of which versions to go with while eliminating the other.
You could easily put them on a historical continuum, similar to real-world history. The Greek versions and culture are the earlier version and the Roman version and culture are the later version. Merge them but call one the evolution of the other.
How I define the Greek/Roman gods will help me define what I want to do with the two cultures that follow them.