I can't see there being a difference between the two. I don't believe the width of the jeep is greater on a 4-door. You should ditch the plastic bumper and slap an aftermarket on on though! I just installed my RR XHD and I love it.
So it's been, and shall be weighed: though many are born, few are "made". Faithful Always, they shall remain, dogs to loose when war is waged.