fenders? mtech2 kits do not have a fender part. Just the front bumper/valance, rear bumper/valance, sideskirts, and door pods.
If you are talking about m3 fenders, you have a lot of work ahead of you my friend. There is a lot of custom fab work to make those fit. If you are going that route, I know I have read a few threads on the subject on R3Vlimted and E30tech.
As for the trunk, I am pretty sure they are different. maybe some else can fill in on the subject.
Maybe you can clarify a little bit. Is about mtech2 or m3 stuff?