.kde and NIS

Our lan is autofs NIS. Should the server have kde 3.1 installed from SuSE 8.2 before I upgrade the clients? At the moment it's a runlevel 3 only box. Upgrading just one client to 8.2 really slows kde down. I was wondering if there is a conflict between 3.0 and 3.1 on the same lan. Or maybe we should wait for some downtime and do the whole lot at once? Maybe 3.1 puts different stuff into .kde than 3.0? (sorry to repeat but got no hits last time so we're still with 8.1 :-( Cheers, Steve.