The '94/5 mustang is a slightly different waterpump then the Explorer, without provision for a mechanical fan. I think the snout is also longer and the pulley has a deeper dish on it. I don't have all the parts laying around anymore to really confirm.
On a Ranger forum I found where someone once adapted an Explorer driver's side bracket to a '94/5 mustang engine for better clearance, they had to come up with a thick shim to bring the bracket forward to line up. I got out of that project 5 years ago, only going off a little memory. Never personally delt with it. I just used a complete Explorer front dress and was happy with it.
Todd Z (and Lars?) found a compressor that will bolt up to the Explorer bracket. I remember it isn't the FS10, something better.
The Explorer pump has shown to be a real good pump. But if you are really stuck on having a Saginaw name attached to a pump, one of the venders had a pump upgrade. Someone once made a bracket that swapped the power steering pump and A/C compressor locations.
There is a lot that can be done. but each little step in changing stuff is a bigger and bigger step into oddball one off time consuming custom build. Then trying to find advise on mixing a bunch of random parts. The internet is great, but with the parts list you are coming up with all I can think of is this is going to turn into a giant clusterflock. Pick an accessory drive (One of the 3 common belt offsets) and work with that. Mixing 2 vehicles of accessory drive is pretty messed up, going for 3 vehicles is only guaranteed to be a disaster.