I am having a dilema

My car (Gti 16v) has had alot of engine work done to it and I am unsure what exactly, I was told it had a TSR
engine so could be 2.0L not the 1.8 that it says it is on log book. The problem is not with the engine, but the power steering pump........
Do I just get one for 1.8 Gti 16v? will it make a difference if it's 2.0L
I have had lots of people give me different advice and I just thought I would ask you guys and get a proper answer

Thanks