I am not a proffessional, BUT! Your not supposed to mix spray heads and rotors on the same zone together. Any brand will work for replacing the heads. Make sure to match the GPM on the nozzles though. You can use Hunter, Rainbird, Toro, Orbit, K-Rain....etc. Although, I always try to keep it to 1 kind/brand for the whole system. Hunter and Rainbird are the best. I would stay away from Toro, they easily break. Orbit is o.k. for systems, but still fail relativly quickly, so I would avoid Orbit.
Anybody else, please correct be if I'm wrong