I'm not sure about the bolt pattern for the two styles, but there are several other things to consider.
1. you must also get the e-brake pedal and linkage from the mj, and must mount it below the dash because the old handle would be covered by the bench.
2. if you have a full console, that will have to be replaced by a mini-console (found in most mjs and few xjs).
I guess that's it. I haven't looked at the bolts on an mj bench but i would guess they're the same or similar.