This version of Ray Force, released on the same date as version 2.3A, is likely a regional variant or revision with subtle differences in programming or perhaps even language support. Without access to the ROMs, it's difficult to confirm the specifics of what differentiates it from version 2.3A. Further research into Sega's arcade release history would be needed to clarify.

Ray Force (Ver 2.3J 1994/01/20)

Rastan Saga (Japan)