From my understanding, these two pickups have vastly different construction. The Fender one is the bass version of the Wide Range humbucker, with cunife magnet pole pieces. The Gibson mudbucker had bar magnets though, right? as per usual with gibson humbuckers. However, they're both notoriously muddy (not necessarily a bad thing) from what I've heard in person and through youtube clips. Is is this due to the position of the pickups? the number of winds of coil? the pot and cap values? Just a bit curious I guess.