I have 2 wheels one is the driving force pro and the other is a momo how do u check if they are rev a or rev b

No idea - manufacturers website?
Why do you need to know?

Quote from lancermat :

I have 2 wheels one is the driving force pro and the other is a momo how do u check if they are rev a or rev b

Don't know about the momo, but DPF revision number can be found from the plastic bag that contains the driver CD, just like in G25.