They should have gone for an alternative universe from the beginning then they would not need to explain anything. The scene between Pirme and Kirk could be like this
Prime - 'George Kirk is that you?
Kirk - No my name is Jim. Jim Kirk
Prime - Jim! Why you're taller, your eyes have changed colour.
Prime - 'George Kirk is that you?
Kirk - No my name is Jim. Jim Kirk
Prime - Jim! Why you're taller, your eyes have changed colour.
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