power steering pump

I'm either looking to buy a power steering pump from someone here or get one off of ebay. However, I have a question. Does it matter what kind of power steering pump I use? What i mean is, can it be from a turbo installed in a N/A, or a "s" installed in an N/A? I've got a 86 N/A and was curious if I could only get a pump from another N/A, 85.5 and up. Appreciate your help for those who respond.

All p/s pumps are the same.

Don't get an "S" pump. They had a pressure switch on the pump. Stick to the N/A or turbos. Those are all the same.

I've got one really cheap on e-bay right now...
Ahmet