The CLT patch is the 'base' client install in terms of the master. The master needs the client libraries at this 'base' before it can be updated.
So, technically, no, this isn't the 'base' (as in 5.1 w/o any MP) install.
This patch is 5.1 MP3 for clients.
The patch you linked was 5.1 MP3 for Master/Medias (and it requires that the client software on the master/media is updated first, thus the confusion).
If you're only patching the clients, you should only need the CLT patch. Although, you should have your master server patched to MP3 before doing your clients.
Unix is a little wacky to patch, compared to Windows ...