No not a chance.
I usually stick with with the version of KDE and/or GNOME which is supplied with the distro I'm using. In the past I've tried to update KDE and GNOME on SUSE Linux (various versions) and have ended up having to re-install. The problem with a KDE/GNOME upgrade on one of the ready made distro's is that each distro might do things differently to the others. SUSE, for instance, puts KDE in /opt/kde whereas Slackware tends to place everything in /usr.
The only time I've installed a brand new KDE is when building a Linux From Scratch system, see
and this is difficult enough. If you want an easy life then stick with what you've already got.
If it isn't broken, don't fix it