You can get the SN95 master cylinder and keep the Fox booster, but it'll be stiff. You won't want the Fox master cylinder whatsoever. The way you worded your question it's tough to see what you're really asking, so that should cover it.
My car has had the Fox booster/SN95 master cylinder for 7 years and it's fine, but I'll be swapping to the SN95 booster soon.