Same species originating from multiple planets?

Like the title states, how would it be possible for the same species to live on multiple planets (before space travel is invented)? Basically, a civilization invents space travel, meets aliens, and surprise, they look almost the same. (common occurrence on sci-fi shows). There can (and should) be some difference in appearance, somewhat like different races on Earth, or dwarfs vs elves kind of deal, but they should be genetically compatible to breed.

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Same species originating from multiple planets?

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