It seems a little silly to have two different versions

I have a policy about the Perl installed with the system / OS - do not touch it. Unless my application is being bundled with the OS or needs to run on the bare OS, I install my own version of Perl. This allows my application to dictate the version of Perl, compile options, library / module versions, and so on without needing to be concerned with a patch or upgrade of the OS hosing my application, or conversely, my application hosing the OS.