Oh, you're wanting to put the TJ unit bearing into your JK axle? Are the TJ ones cheaper or something? It really depends on the knuckle & the spline count (there may be other things that matter too). Maybe it's possible to put TJ knuckles on the JK axle in which case the TJ bearing would definitely fit as long as the axle spline count matches.
Some TJ's have ABS, no idea what componentry is involved if they do, mine doesn't have it. In light of lack of answers here, it might be a fun exercise to look at part numbers across various years on rock auto. You can learn a lot that way.