Across all models the heads are the same even the springs. Exhaust Cams are the only difference, but thats not the head per-se.
Dry gasket. I think maybe your head probably didn't get powder coated more from the price than from anyhting else. I understand that you can powder coat a head if the shop has a bit of ability and experience. Resurface happens post coating. It isn't done for alot of reasons the biggest being a heat barrier issue.