ok, nobody seems to want to answer, so i will do even tho i don't think i'm an expert.
Yes, you can install them over the older ones. You can even insall some of the components over the older ones and uninstall some others.
Nonetheless, it's possible you have problems trying to do so, as it has been my case. It is not that they are not going to do any damage to your system, but just that they'll hang your comp. Try it. hope it will help.