I remember reading LONG ago that the Power Base Converter for Genesis was nothing more than a pass through because Genesis and MS carts are different pin layouts. If that's true, then would it be possible to flash a Master System game onto a Genesis cartridge and have, for example, a US version of that Phantasy Star 1 rerelease in Japan?

Bonus question, if the game in question had FM capabilities, would they be activated through the Genesis FM chip?