Actually, on the Liberty it's very strange. You cannot go on the assumption that a Limited will be optioned nicer. In my search last year, I found a Limited that had NOTHING. No sunroof, no overhead console, no leather seats, no 17" rims, no sat. radio, NOTHING. All it had was cruise control. Conversely, I found a Sport that had every option you could think of including power heated seats. And I've seen Sports and Limiteds both in all configurations between.
The ONLY true difference that you can bet on for sure is that the Sports got grey textured fender moldings...and the Limiteds all got body color matched fender moldings. Other than that...it's a crap shoot and you'll have to actually look at the vehicle to see which options it got. Jeep really packaged these things in a weird, illogical way.
'92 YJ - heavily modded
'96 ZJ - heavily modded
'05 KJ CRD Limited - 370 lb./ft. from a 4-cylinder and trail ready. Pure awesomeness.
'11 Mango Tango JKU Sport - Mods
'12 Dozer JKU Sport S - 6-speed - ACE rock rails - Max Tow package - Daystar spacers - 33x12.50 Duratracs