I have a 2000 Jeep Grand Cherokee with the 4.0 6 Cyl. Can I exchange with a 2003 4.0 with a single coil pack head ?
Maybe. Maybe not. I’m guessing, not.
There are probably differences in the engine control computers, and your 2000 computer may not be able to make the 2003 engine run.
Engine swaps are not as simple as they used to be. I wouldn’t spend my money unless I was positive it would work.
I agree with McP.
Jeep owners have their own subculture. Perhaps a Jeep specific website or forum would be a better place to find the answer.