There are a few little things, but some I'm not positive about. I only had an XJ for a few months.
If you have the pushbutton hatch opener, I think that carries on from Gremlin/Pacer/Kammback hatches. I half think the cluster is the same dimensions. I have suspicions the HVAC controls swap.
Keep the rear springs, if you rebuild the leaves with the Eagle top leaf you get a lift. The circuit for the rear defogger is like the early push button AMC Car circuits; before the toggle switch was used.
I know Wagoneer speaker grilles are the same, but I don't know about XJ ones.