I was wondering are there any diffrences in the clutches for s5 and s4? Are they the same for both cars?

 

according to Mazdatrix, so, there is a difference but it's one that is not that critical.

http://www.mazdatrix.com/f86-92tb.htm

 

Do you know if you can use either cluctch on the other car. I am putting an S4 motor in an S5 car with an S5 tranny. I found a really good price on a S5 stage 1 exedy clutch. If it will still work I will just use it.

 

Yeah, it should work without any problems. I'd say to go for it.

Zach