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Sadly, I believe the power loss is equal to that of NA. Turbo boost is controlled by the wastegate so while peak boost will probably be lower at high altitude, it can usually compensate and bypass less the rest of the time. Supercharger boost is mechanically linked to the crankshaft so it's always making a (maximum) relative boost to the engine RPM. If you're getting 2PSI less atmospheric pressure, then you're getting 2PSI less boost, too.
Not an expert but this is my understanding.
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