You've asked this before.Personally I don't think your copy of Moonbase is anything more than a basement bootleg, thanks to lack of copy protection on old PC games. I wouldn't add it if it was me.
i have a unknown version moonbase and thare no difference between retail version and this one but it has a diffident disk what do you you think do i add it or not
What I'm saying it is looks like someone made a copy of the game in their basement and then sold it to you. Thus, it's a bootleg, an illegal copy.