I don't think I've seen those dual games out in the wild. Maybe I played Invinco. I always wondered how to determine where a game was released. Do you think the recent dump was also released in the US? Of course in a slightly different form.
I've tried to determine what region other games came from. I assume at times you can only go by where they were discovered.
Nice find. I hope an English version can be found in the future.