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With a limit of POD not behind Humans first evolving in Ethiopian highlands,have two Human groups or ethnicities evolving to be exactly identical in appearence and language/language families. You are at liberty to choose which Ethnicity you want. But the result is as mentioned. It could most probably happen through particular migration patterns of early Humans or Hominids engineered.
Example is like this: Proto-Indo-Europeans evolved first in the Caucasus. You can find ways how a migration of early Humans can result in Proto-Indo-Europeans evolving in the Americas or New Zealand as well. Just an example. You can choose how you want to get this.