After running CC update I have TWO versions of Photoshop CC. Which should I delete?

I had the CC version of Photoshop installed. A week or two ago I ran the CC updater and it listed something called "Adobe Photoshop CC 2014" in addition to "Adobe Photoshop CC." I selected "update all" and ended up with what appear to be two copies of Photoshop on my OS X Mac:

     Adobe Photoshop CC 2014 - version 15.0.0

     Adobe Photoshop CC - version 14.2.1

Questions:

It seems like the "CC 2014" copy is a new version and that I do not need the original "CC" installation, right?

Should I just run the uninstaller in the "CC" version folder, and will this leave the "CC 2014" intact?

Is there a reason this happened, and should I do anything to prevent a repeat?

Thanks,

Dan