Redhat may prefer Gnome to KDE thats all. So it has all Gnome packages. or it may be the way you installed, to be hoest I don't know.
As for RPMS daft me didn't check the KDE site
If you download some of these rpms (You probably have base)
graphics networking multimedia etc.. will give you a good chunck of the programs for KDE. Goto www.kde.org
theirs an application menu on the right hand side which lists whats in the packages.
There big by the way.