Version and music are on the CD, but the version is also on the cartridge. Whenever you’re using a different version CD, all you have to do is “Rewrite Flash” or some similar option in the CPS3 menu and it updates the cart with the info from the CD (takes an hour or two).
Voice tracks and region are both permenantly stored on the cart.
So, there are no regional differences on the CD; both US and J version 3rd Strikes use the same CD. The only different CDs are Version 1 and 2.
Excellentcom.net does the same thing, it’s also only for the Asian version, a guy from a french arcade forum (neo-arcadia) got his dead 3S back to life (including the new battery) for 55USD + shippping.
i’ve had my cart revived by excellentcom.net. they charge $95 for “fake” carts, which probably are some dead Jojo or whatever carts turned into 3s. that’s what came with my 3s kit, so it cost me that much. then i had the batt changed so they charged me a total of $110. pretty good, still.