I dont think too many people care about having matching diffs, as long as the gear ratios are the same.
I'm not a serious offroader, but I'm goin on my second offroading trip to moab this summer... which is a mecca of sorts for offroaders
I know some of the guys on the explorerforum(
www.explorerforum.com) do a dana 44 swap of some sort... might put out a couple lines there see if anyone bites.