I am planning on buying a CAI from a guy, however he has a 2.0L manual, and I have a 2.3L automatic. will I be able to use the same intake, or do they make seperate intakes for the different engines?

sorry you will need a whole new intake, not only does your cars vary in liters but your is auto and his is man. and yes that does make a difference

That is not necessarily true. I can't speak of the other brands, but the Simota CAI that I sell fits both engines,
auto or manual. In any case, the liters don't matter at all when talking about bolt-ons.