The rear hubs swap 1:1.  The ltr hubs will add about 1/2" to the stance per side. (some 87's and up)  the 85 -86 will not swap.  24 spline vs 26 spline.

I heard z400 spindles swap will little tweaking.

Instead of doing a front clip swap, it's much easier just to do a long travel setup - and just as good.