XJ is a Cherokee, ZJ is a Grand from 93 to 98 then WJ till sometime in the 2000s and now WK. And there is quite a bit of difference. Kinda like saying what's the difference in a F150 and a Ranger.
If you have an owners manual it will be in there otherwise find someone who has one and copy it. I think I have one for a 93 around here somewhere and if I can find it I'll shot you a copy.