The XJ Wagoneer bumper is the same. The grill is different but you can use a Cherokee grill if you want to (same with the headlight bezels even though you said they aren't damaged) , they are the same size and interchangeable but the slats are different.
Is it a Wagoneer or a Briarwood? The XJ Wagoneer was only made from 1984-1990 so if it is a Wagoneer, either it isn't a 92 or a previous owner converted a Cherokee into a Wagoneer (relatively easy to do, all parts are interchangeable). A Cherokee Briarwood has the wood grain and several Wagoneer "features" but shares the same body pannels, grill etc. as the Cherokee.