all green b boards play in japanese unless pheonixed.
Not entirely truth, in some places (Brazil, Mexico, etc) there are green B boards that were officially converted to their local region/language.
I have a green Marvel Super Heroes Vs Street Fighter B board that was officially converted to Brazil region (has english dip switch set up screen).
I also saw other green B boards like Street Fighter Zero 2, Street Fighter Zero 2 Alpha, Street Fighter Alpha 3 and Marvel Super Heroes all officially converted. They have english dip switch set up screen and in game portuguese/english dialog texts (orange would be the correct color for those B boards).