Depends on the the donor seat options, and how much you want the electrics to work...
When I swapped out the seats in my '98 XJ for '02 Grand Seats, I was on the look out for the "Laredo" package seats. Though they are electric, the key feature on the Laredo package seats is that the seat back recline is operated by a manual lever, just like the XJ seats. So, you won't have to wire up the seat recline adjust switch as there is none...
Once I got the donor seats, I removed the stock ones; removed the seat rails and swapped them onto the donor seats. Whole process took less than an hour.
Keep the wiring harness for the switch plug on the donor seats at they could come in handy. I hooked up my garage door opener to one of the seat switches. I plan to use the other for other switch points for rock lights and such...