Previous owner had an engine fire.  I also happen to have a totaled
'01 GTI VR6 laying around.  Engine is fine and dandy as is all wiring,
etc.

My natural reaction is YEAH BABY.  How different are the two ?  Is
this going to be as straightforward as i think ?

Silly questions i know, but considering i've never done anything like
this before, and both cars are 400 miles from where i currently live,
it's valid.  I know a bit about cars in theory, but have never done
much.

Keeping in mind that i have all the parts from both cars, and in about
6-9 months i will have access to a superb shop with access to every
tool known to mankind, what challenges can i expect ?  It can only be
easier than any other a4->a3 swap, am i right ?

Whatever, just looking for some info before i get my hands dirty.
links and whatnot are welcome.  Thanks.