Sure, same general premise, but the structure is very different between them. In Dances with Wolves, Dunbar is basically abandoned by his people and slowly assimilates into the local village. By the time Dunbar’s people return in the third act, they’re no longer his people at all. In Pocahontas and Avatar, Smith and Sully are part of an active and present colonial force, wind up on generally friendly terms with the locals, start dating the chief’s daughter, and wind up with a strong case of conflicting loyalties, having to pick between their people and their lover’s people when the fighting starts.