The differences between the Fox and 94/95 (Engine specific) are:
Timing Cover
Water Pump
Acc. Brackets
Intakes
Fuel rails/injectors
And most Fox Bodies came with a Mechanical fuel pump eccentric on the cam behind the timing over. If you're swapping a Fox motor into a 94/95, you need to use the 94/95 timing cover/water pump, and REMOVE THE FUEL PUMP ECCENRIC. It's not necessary, since we don't use mechanical fuel pumps anymore, and if you leave it on, you'll rip the 94/95 timing cover to shreds, or ruin your valvetrain.
The injectors and rails can interchange between the Foxes and 94/95's. The 94/95 fuel rails are said to be beefier, and handle more power FWIW.
The 94/95 computer can still be used, don't worry. It's more sensitive to aftermarket stuff (Cams are the main thing) than an A9L or A9P from a Fox, but modern tuning stuff (Tweecer for instance) can overcome most of that.