if the are for the same engine, yes they will. in other words if you get an automatic for a 2.3 from an 86 mustang, and are putting it into the 89 2.3, go for it.
What we are trying to say is this. A 4cylinder AOD from an 86 will work in a 4 cylinder 93.
4 cyl to 4 cyl YES
8 cyl to 8 cyl YES
4cyl to 8 cyl NO
8cyl to 4cyl NO