Front axle unit bearing question

I am looking to swap my front axle unit bearings from my 1994 YJ 4.0L to my 1994 XJ 4.0L and I am wondering if they are the same...

I know people have had issues with the newer Cherokees... I guess the bearings on the newer Cherokees are a little wider than the YJ/TJ bearings. Are the older XJ's also different?

Yes they are the same.
84-89 are in a group,90-99 another group.Rotors fall into the same groups.
HTH
Wayne

I've got a rythmic chirp that comes from my right front wheel, I'm pretty sure that it's the bearing (I've replaced every other moving part down there...) and there is no free play. I've got 149,xxx miles so I figure they're getting worn. They also generate a significant whirling noise when at highway speed, so I'm assuming that all these are signs that they are wearing out. I know it's not the exact answer you're looking for, but hopefully it give a little insight!

Yes they can be noisey take front wheel off and spin the bearing by hand see if it feels rough or makes noise.