The modern version (W65C02S) is not 100% pin compatible. It would be very obvious very quickly if that had been done. There isn't another modern equivalent with the same pinout that I'm aware of.
Yes, there are many original 6502s around, and they are probably worth half of an R65C02, or even less.
Are there so many original 6052s around that it's cheaper to just relabel those? (I guess cheap 6502s were really everywhere in the 80s/90s)