Correct but that is not the question, the question is what are the differences. My first response was, if you need to ask you probably don't need the proBut the Air has always been aimed at users for whom that's not a part of their daily workflow. Its for users who may occasionally do that sort of work, so a slightly slower performance on that sort of thing really doesn't matter.
If you're doing that work every day, that's when you are going to want to buy the more powerful machines because seconds and minutes saved per job all adds up.