91 2.5 to 4.0 swap

[MWeirick89]

While I've found plenty of write-ups and info on 2.5 to 4.0 swaps on pre-91 MJs, I haven't found much info on my particular situation. I have a 91 Comanche that was originally and 2.5 5 speed 2wd. I recently bought the Jeep as a roller after the PO gave up on a OM617 diesel swap. My question is that since I already have an HO era truck, will a 91-95 4.0 harness mate up to the firewall connector without issue? If not, I'm just going to full 97+ swap the Jeep. I own a Jeep salvage business so parts aren't hard for me to come by. Thanks in advance, Mike