If by "Surround" you mean version 2.67, I don't remember if it's the same organ ID and data package numbers as v2 or not. But do you see two Caen organs in your Load Organ list? If so, you certainly can uninstall the organ you're not using(e.g. v2), without affecting the one you keep (e.g. v2.67) -- I mean the organ, not the data packages.
NOTE: If there aren't any old v2 data packages installed, you're done.
If the data packages are actually distinct between the two versions (different package numbers), you can uninstall the old ones if you can identify the right packages.
Or, to clean it up for sure, you can uninstall both organs, taking the option *not* to delete your settings on the one you're using, then uninstall all the Caen data packages you see, then install Caen 2.67 from the RAR files. You can download them from SP under your account in Products if you didn't save them.
For New Haven, and other samplesets that install more than one organ (ODF) in the same installation, you can always uninstall the organ variants you're not using like wet, dry, semidry, and historical console with and without aardvarks. Don't uninstall the data packages or the organ variant you want to use. Don't choose to delete your settings, because sometimes the variants all share settings (St. Maximin original and extended, for example).