I haven't noticed much difference between my CJ and my buddies YJ top other than the CJ top being lighter. Which is really nice when you have to pull it off. Remember the rear gate latches differently between YJs and CJs. YJ gates hold the back glass shut.
85' CJ7 Laredo, 258 I-6, T-176, Dana 30, AMC 20
99' WJ Laredo 4.0L NP242, RC Long Arm, 44a vari lok