John "Omega" Williams
If you mean between Limited and Unlimited then they are pretty much the same aside from a few chard alterations and rules tweaks.
The Five Rings version though is essentially a new game.
FRPG produced a new version of the game with the same card backs and set in the same world, but with completely different mechanics making it incompatible with the first version of the game. The second version of the game had seven card sets. The first 6 were numbered and released once a month. They were known as Phase 1 through 6. The final set, Equinox, combined together three of the smaller numbered sets (7-9) into one larger set.