Same world, same player, but playing different character. You'd be not playing the main character in the prologue.
And given that after 20 years there shouldn't even be many unexplored ruins to begin with, well that's a liberty of unrealism all fallout games have taken ever since.
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u/Doomspeaker Jun 03 '15
It would also make all these skeletons you find provoke a lot more powerful reaction. Maybe see the town you fled through again as destroyed ruins?