They may not, but not sure why. The hole in the inner C is the same size and the tapered pins are only different by the two common tapers, 1.5 and 2.0" per foot. Nothing else is different. The TJ lower is 1.5" per foot. The JK lower is 2.0" per foot same as the WJ. I'll have to check an upper hole in a JK knuckle and see what it is.
Not that I would but I could stop the machinist and have him taper the holes to fit the JK balljoints on a couple of sets of TJ knuckles with little effort, not sure why though other than just to see how well it works.