It's a moot point now since he does have separate neck & bridge pickups, but my stating "However it doesn't really matter." was based on the fact that vintage guitars did not have differently wound pickups and the compensation came from how each pickup was adjusted in relation to the strings.

It was good to point out the difference in the markings and their respective positions though!

Had Grandpa been unfortunate enough to have received two neck pickups, they still could have worked. There are still guitars made today that have identical pickups for both positions. I'm pretty sure that there is at least no difference in pole spacing on the kit pickups.

My PBG PRS1-TS build has 2 Wilkinson mini-humbuckers in it that are identical (within a a few ohms) and it works just fine and sounds great.