I think this would work:
Code:
cd /usr/X11R6/bin
cp startx startx2
edit 'startx2' and change:
Code:
sysclientrc=/usr/X11R6/lib/X11/xinit/xinitrc
with
Code:
sysclientrc=/usr/X11R6/lib/X11/xinit/xinitrc2
then:
Code:
cd /etc/X11/xinit
cp xinitrc.kde xinitrc.kde2
edit 'xinitrc.kde' and at the and of the file change 'startkde' with '/path_to_your_first_kde/bin/startkde'
then edit 'xinitrc.kde2' and again change 'startkde' with '/path_to_your_second_kde/bin/startkde'.
so to start your first kde run 'startx' and 'startx2' for the second kde.
I haven't tried this, but I think it should work.