As far as I can tell, the difference between the Carbon one and the NIBs and SDL versions is that the Carbon one works, while the others don't!
They won't even load - the icon starts appearing in the dock, then disappears; the console says something about: path: @executable/Contents/... doesn't exist.
It's not something I have any idea how to fix. Any offerings? I would like to see the .nib files that already exist within the Carbon package actually used, except maybe for that one that just tells you to 'stop looking at my nib!' :).