Opening Zero Hour Maps in Generals

[Me Myself & Pi]

I'm wondering if it's possible to import a map from Zero Hour into Generals. Since we've got two copies of Generals, but only one of Zero Hour, we play that on multiplayer instead. (We can't get Zero Hour to with the same copy work. The moment one of us gets online, the other guy get's kicked off. It also doesn't work of LAN play.) So I'm trying to get some of my Zero Hour maps into Generals. But whenever I try to open a map from Zero Hour in the Generals world builder, it's just a blank map. All the players are there but it's just a square grey terrain of nothingness. Is there a way to get it working? If not, that's okay, I'll just remake the map. It's fun anyway!