You are right, it works from Z28 to 6B, but I tryed from 6B to Z28 and it doesn't work.
Anyway thank you guys for replying.
Offtopic. If I want make a server with tweaks, how do I get it on the CPW whitelist? I saw before that you have to email the name of the server, but I can't remember where.
You should just add options /modified=yes to server's configuration file.
Note that this option only works with password-protected servers, but you can set password to e.g. 1 and write it in server's name if you want it to be public.
/modified=yes only prevents people from getting kicked/banned due to cheats, they still should match server settings (or server should have the multimod .exe)