I may be wrong but I think only the F and F2 screens are interchangeable with each other.

A list of F screens: http://www.mir.com.my/michaeliu/came...ff2screens.htm

I personally enjoy using the plain ground glass type the most, since it kind of enhances the entire point of using a reflex in the first place, but if you're worried about brightness anything with a fresnel screen is probably a better choice.