You're entering a world of pain.
As to the question at hand, I think the custom shops are overwound, at least the description states so, while the Original seem not to be overwound (no mention of it in the description), yet the still have the same DC resistance. I'm not sure if the MIA pickups use Formvar wire, the CS do.
Here are
Custom '60s Jazz Bass Bridge Pickup:
DC Resistance: 7.4K
Inductance: 3.25Henries
Custom '60s Jazz Bass Neck Pickup:
DC Resistance: 7.1K
Inductance: 3.18Henries
Specifications:
Original Jazz Bass Bridge
DC Resistance 7.5K
Inductance 3.35 Henries
Original Jazz Bass Neck
DC Resisitance 7.25K
Inductance 3.2 Henries