[ramonesfreak]

im guessing the impedance would have been different if so, but is it still possible someone in the past removed some of the windings on the pickups to lower the output?

are the pickups the same exact distance from the strings on both instruments?

im not an expert but i would guess that the pots are causing the difference. perhaps at one time the pots went bad and were replaced or, are factory installed but are different than the other instrument