I did some more tests with both the client and server, and they have to have same addmodpaths that don't include or exclude from each other any mods.
Obviously if the client doesn't have texture, sounds, meshes, of guns and vehicles, how could it know what to load? It needs the Xpack1 and/or Xpack2 folder too.
But I think the kewlest part is that my modkit.exe is only 100kb and click once to turn on and again to off to join any regular bf1942 map that can have any motorcycle, jetpack, T34, sturmtiger, from the other expansions. It's really easy for clans to have fresh maps. This is not serverside but a quick xfire in clans, one click of exe and everyone has joined with no map downloads.
Here's links for noob
Changing weapons kit for soldiers.
tutorial.php?page=changekits.html******
Replace/Add vehicles
tutorial.php?page=replacevehicles.html