there will be a load of other expenses you'll come across during your conversion though and i don't think it would be worth the hassle mate, i know its probably not what you want to hear but you'd be better off selling the 2.0l and just buying a 1.8t...
I don't know exactly whats involved in a 2.0l-1.8l conversion but i've been involved in few different engine swaps in over the years and it's never as simple and cheap as undoing a few bolts and doing doing them back up again...