Looks like there may have been two prints. I had copies of sample Triad Stone and Rocket Coaster in my hands in the past and I don't recall obis of different colors, though I may not have noticed...
If one game was Japanese it should be easy to tell, as the text on the back of the sleeve or in the instructions would be in Japanese.
Looks like pictures online are of both green and black, so you just have the complete Space Berserker U.S. LA set with variants.