That would all depend on what model you are refering too. 1991 and 1992 Mazda 323 parts are all interchangable (there may be a few exceptions). If your refering to another model, someone else will have to address that aspect.
The Mazda 323 of that time from had a 1600cc engine but that isn't going to effect the issue of where to get a wiring diagram. Haynes makes a manual for the 1990-1994 Mazda 323. If you have a 1986-1989 Mazda 323, you will need to get a FSM (Factory Service Manual).