Inspired by a conversation I've been having on another board, I wanted to point out that the Arrowverse has established that the mechanics of its internal Multiverse incorporate the idea of multiversal doppelgangers being entirely different people (with entirely different names, backstories, etc.), which creates the justification for potentially incorporating stuff like Smallville, Lois & Clark, and the Donnerverse movies since there are characters in those universes who have or will have "doppelgangers" on series that already currently exist within the framework of the "Arrow-Derived Multiversal Reality Construct".