Although the readings Rich got aren't true to the resistance of the coils, (because he took them from the output, after the pots and switch) they do accurately show the variance, as long as he used the same ohms meter, which he did. Ohms resistance is a rough indicator of output, but magnet strength, type, wire thickness, coil/bobbin size and many other things ultimately play a big part in the output. That's why Dimarzio wants you to see the output in millivolts. Duncan doesn't really do anything unconventional, like "dual resonance coils" and an ohms reading is much more indicative of power and tonality on a traditionally designed pickup.
But the undeniable point here is that a variance in the ohms reading between two pickups that are supposed to be the same is in direct correlation to manufacturing tolerances. And why is one higher? Maybe only one of the coils was overwound, maybe both. In either case you have a difference in tone. And which of the two coils was overwound would also affect the tone. I'm not saying every pickup should be dead on, there's thousands of winds on there, but I've heard enough PAF Pros to pick up on inconsistencies. So all PAF Pro's are supposed to be the same, but you'll probably find you like some more than others. I know I do.