This version, designated as 'Rev A', represents a revision or updated release of Major League Baseball for the NES. While the original game aimed for a simulation-style approach, details on the specific changes introduced in revision A are scarce. Differences may include minor bug fixes, gameplay tweaks, or even some graphical adjustments.  Without more specific information on the changes from the initial release, it's challenging to fully articulate its differences from the original release.  The developer remains the same as the original game, but the version number signifies a notable alteration to the original title released in the USA.

Major League Baseball (USA) (Rev A)

Majaventure - Mahjong Senki (Japan)