To answer the question, I mention the main points and compare a late CJ to an early YJ (91 on had fuel injection and a boxed rear roll bar).
Frame: YJ is 4 inches wider
Engine/ carb: same
tranny: both medium to light strength
t case: CJ is all gear and YJ is chain driven
Front axle: CJ has locking hubs (diff doesn't spin in 2wd) and YJ has no lock outs (diff spins while moving)
Rear axle: CJ had a 2 piece hub (most late CJ) and YJ had a C clip (most) CJ has 5 on 5.5 bolt pattern while YJ is 5 on 4.5
Springs: YJs are a tad longer and wider in front (yj also sits a tad lower)(CJ has more articulation)
Body: dashes are differnt, tailgate and hardtops are different, YJ has side mirrors on doors (same doors), gas cap on opp side, CJ windshield folds down in seconds, YJ has "Bars" bolted in, 85 on had fold n tumble rear seat on both, ETC.
Both will have a sway bar and have similar handling characteristics while the yj is a tad more road friendly and less off road ability and the CJ is opposite. They can interchange about 75 to 80 percent of thier parts. The problem is that a lot of folks try to compare a new Wrangler to the older style of CJ (pre 76) and there is a huge differnce there.
1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
2003 Inca Gold TJ Rubicon