True, its technicaly an FN10. But the things that make it an FN10 realy dont effect the rear end geometry, possibly the air ride. The center section is aluminum, where as mine (stock) is iron, a difference of about 20 lbs. But as far as the rest of it goes, its no stronger. In fact, aside from the air ride in place of the shocks, its exactly the same. I've been up to my neck in the cars for half a decade, know all about the FN10s and MN12s. The FN10 and the MN12 both use the same monocoque/unibody. Most of its few mechanical differences lie up front.
But as far as spindle/wheel bearings etc go, direct swap.