No, there is no generalizing as far as I know. When you choose a MSN program, you choose a track, such as ACNP, FNP, ANP, PNP, PsychNP... you choose one track and "specialize" in that track. The MSN for all of these will have some of the same classes, like pharm, patho, etc and then branch off in the individual courses specific to your track. So if you find a RN-MSN/NP-Psych option, you will graduate with your MSN NP in psych. THEN if you want to get another NP certificate, you can get a postmasters in any of the others.