'74 Jazz pickup question

[Giraffe]

I recently traded a dealer for a Jazz Bass with a blond ash body and a maple fingerboard with pearl block inlays. The serial number (602xxx) is stamped into the four-bolt neck plate. There is no date written on the neck heel or anywhere else, which I understand is consistent with the 1974 birthdate suggested by the serial number. The slightly musty-smelling black tolex case appears to be right. The overall condition of the whole package seemed to be what one would expect of an instrument that had been played a bit, and stored for a bit as well. My question concerns the originality of the pickups.

The pots are dated 2004, and the ceramic capacitor looks fairly new as well. The filth buildup pattern on the top indicates that an aftermarket bridge was installed at one time, although all parts up to here appear to be period correct (except for the missing thumb rest and bells). The most likely conclusion was that the bass had been modified and/or repaired in the past but original parts might have been re-installed.

Both pickups have the thin copper plates in the pickup cavities, and the sponges are "melted" onto the plates and the bottoms of the pickups fairly well. What I can see of the brown/tan cardboard flatwork looks original enough to me. The neck pickup is wound with the dark purplish wire I've seen on Fender guitar pickups from this period, but the bridge pickup wire is obviously different, being bright copper in color. The neck pickup measures 7.14K ohms, the bridge measures 6.85K.

Could I conclude that the bridge pickup is not original, or did Fender use different wire for the two pickups?

I searched this to no avail. I'm sure vintage enthusiasts have seen a few of these and know what it should look like. I put this question in the pickups forum but there wasn't much of a response, so I figured there should be a few repair techs around who have torn down a few of these.

Thanks for any help you can give!