The alts are the same but I think the voltage reg (big green plug) is different 4th v's 5th gen. Though swapping them out is not too big of a deal (as long as that's not what's faulty in the first instance).
Also pully sizes can be different. But you could swap your one over. I've had 3 different alternators recently off various people. All the same apart from one had a different size pulley, and the other two where running different amp outputs.
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