Alien race similar to human but without anything in common
(First of all, perhaps this is a duplicate of this question, but I'll give it a go since I'd like to focus on something different. Or the answer is there but I couldn't quite catch it. Oh boy... *facepalms*)
A human has been kidnapped by aliens; after years and years of capture and travel, he meets a fellow human, almost identical to him (not just humanoid in shape, with a head, a torso, two arms and two legs: a human) - the difference is that the new one doesn't come from Earth and has never been there: in fact, he comes from a planet in another galaxy, with a different tech level than Earth's (irrelevant for the issue). How (and if) can this be possible?
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