Yes. Anything that can run in Ubuntu can run in Kubuntu and vice versa.
However, there is also kubuntu-restricted-extras in the repos. BTW, you can
have both KDE and GNOME installed and switch between them at login. That way
you can try each one out and see what works best for you. The difference is
largely personal choice.

Many people think that KDE more closely resembles Windows, but I think that
GNOME is more like Windows. It is dumbed down (few options) as in Windows.
It has double click enabled by default like Windows. The big difference is
the panel at the top. KDE uses the panel at the bottom a la Windows but it
is highly configurable and integrated, unlike Windows and uses single click
by default.

I prefer KDE for the options it gives because I like to tinker and find KDE
default applications just better. I prefer Amarok to Rhythmbox, K3B to
Brasero, Dolphin to Nautius, DigiKam to F-Spot, Kmail to Evolution, Kdenlive
to PitiVi, Kate to Gedit, Choqok to Gwibber and there are many that KDE has
that Gnome doesn't such as K9copy, Krita, Kwallet, default Clipboard manager
and more. Plus with KDE you get 3D effects without Compiz and it has a great
OS/X style panel of its own (Fancy Tasks). but this is all arguable as many
people would say the opposite. It comes down to what you need to do and how
you like it done. The best thing is to have a choice of two great desktops
(and more if you include XFCE, LXDE and Enlightenment).