not sure, but here's what Duncan says about wiring with another SJB-2:
"The SBJ-2 Pickups are a calibrated Neck and Bridge set. The Neck pickup is slightly narrower. The Neck is RW/RP for hum canceling when both pickups are used together."
I'm interested in this but have a question. you said you bought the set for the neck pickup, but yet this neck pickup is for sale? I just want to verify...is this the neck or bridge pickup?