interesting question however depends on what you want to achieve here. Couple of things below
Rims are virtually the same size only mm's (roughly 3mm wider each side) in it!
The +12 is still going to have more poke (towards the guard) by roughly 5mm of or so
what tyre size do you want to run? Again as its only 5mm give or take overall not much difference
hope that helps you a touch