4.7 Engine issues

I have a 2002 1500 with a 4.7L. It has a knock in the motor. I was trying to get it back on the road sooner and decided to pick up a use motor. It came out of a 2002 durango. I knew about the 32 tooth vs 16 tooth for that year but thought i was ok when I ck'd the cam tone wheel and counted 16. The harness came with the used motor. I guess if I would have done more research i would have seen the 4 connectors as a problem. Anyway motor is installed and of course won't start. My question is since I have the harness, can I change that and the computer and get it to work or is that more painful than pulling the motor again?