general J pickup question

the bass i have has a J bridge "sized" route in the neck position. i know many manufacturers voice the bridge and neck pickups differently. question is, what brands can i put a J "sized" pickup in the neck position without it sounding weird? i know carvin is one. any others? also, side question, is it possible to use one active and one passive pickup at the same time or do they both need to be the same?