He already said both are 5x5 bolt pattern. And he's correct about that. His question is about backspacing, and I believe that the GC wheels were all 5.5" backspacing, whereas the JK wheels are 6.0" backspacing. So, they'll sit inboard another 0.5" which may or may not cause issues depending on what tires you run on them. On the outboard side they'll be even because the JK wheels are 0.5" wider, so the stance will stay the same. Only difference will be on the inside of the wheel and whether it'll contact any suspension parts on the GC.
'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