Sometimes the Japan shops will stamp the label with info about the chip like "hi boost" or something like that.
Other times it's just a "version #".
It sounds like yours is just a version #.
With that said, there is very little you can do with a stock ECU reprogram.
Automatic is the elimination of the overboost fuel-cut.
I doubt fuel is tweaked very much, as this isn't very easy to do.
Typically, they adjust the ignition timing to run a little bit more aggressive.
Sorry I can't give you more info other than that.
R.E. Amemiya will not answer any questions unless you can talk to them in Japanese.
-Ted