All JO maps also work on Mac.
Just put the .pk3 files of the mod into your ~/Library/Application Support/Jedi Knight II/base/ folder and run JO. (For some maps to work you might have to open ingame console and type 'map <mapname>' to run them.)
Also, like Ham Yoyo said, get Jedi Academy. All the cool new mods are released for JA.