Since they've already established a multiverse, it wouldn't be impossible to explain that the Superman on Kara's Earth looks the same as the Superman from SV's Earth. There's already precedent for it on Flash with all of the various doppelgangers. There's even precedent for characters who aren't the same to look like each other with Jay Garrick and Henry Allen.
It's also not impossible to imagine they asked him to appear literally as SV's Clark. We've heard from Grant Gustin that one of their goals on that show is to adapt Crisis on Infinite Earths. Wouldn't shock me if they've reached out to anyone and everyone who has ever played a live action DC superhero/character and at least asked the question, "If we did it, would you be in?".
Within reason, of course. I doubt they asked Christian Bale, for example.
It's also not impossible to imagine they asked him to appear literally as SV's Clark. We've heard from Grant Gustin that one of their goals on that show is to adapt Crisis on Infinite Earths. Wouldn't shock me if they've reached out to anyone and everyone who has ever played a live action DC superhero/character and at least asked the question, "If we did it, would you be in?".
Within reason, of course. I doubt they asked Christian Bale, for example.
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