Fender basses overall don't sell as well on the used market as a Stingray. The pickups are not original but if he includes the original pups then that's not a big deal. You're not talking about much different in price. Down where I am this is the range they both fetch on Craigslist:
Stingray: $750-900
Fender USA Pbass: $600-750
If I were you I would say the p-bass+$300
Stingray: $750-900
Fender USA Pbass: $600-750
If I were you I would say the p-bass+$300