There are some differences...
When you get to the wing kit you're going to need about 300 copper clecos (⅛"). The ratio of silver to copper clecos for the -12 is roughly the inverse of what you probably already have. Lots of copper, not so many silver.
There are several places, including right away in the stabilator spar assembly, where you need a 120 degree ⅛" countersink for the flush pop rivets.
You more than likely do have most of the tools. It would be a very good idea to closely peruse the RV-12 tool kits advertised by Avery, Cleaveland, Isham, et al, to discover what you don't have.
A couple "don't be without it" items: Pneumatic rivet puller (check), Cleaveland Main Squeeze, Avery 5012 "Close Quarter Rivet Puller Tool."
About that last item...the foto on their site can be confusing. What you want is the little steel bar thingy under the puller. Absolutely a must. For that matter, it is best to also have that puller shown in the same foto, even though it costs a kidney. Those two doodads save a whole lot of bad words. Definitely worth it IMHO.