I've worked on;
2 1993 Mk3's
1 1994 Mk3
1 1995 Mk3
3 1996 Mk3's
I've chopped and changed suspension more times than I care to remember and I've never came across any problems with spring plates or top mounts, so why you so worried?
I've even put Mk3 suspension on a Mk2 and vise versa without any problems.