all of the beats on doggystyle have the same sound texture.
they all sound like they were produced by dr. dre, with barney on keys, butch on drums, tony green on bass, etc etc.
all of the "final version" of songs that is.
i'm sure some of them, maybe even most of them, had corresponding "original version" where the music was made by daz and or warren g. so you can look at it like that as to who made what music, if you want to think of it in those terms rather than who "produced" what.