One of them is a graphical client (or rather, a shell extension for Windows), and the other is a command line client 1 . Usage is very different from convenience functions, however, the basic function installed for working with Subversion repositories is exactly the same as for both libraries.
As for the Subversion server, this is actually different software, although it is sometimes distributed along with the command line client.
1 Side notes: I have long stopped using the branded version of CollabNet because it is located outside the registration wall. I found Slik SVN as a good alternative. This is exactly the same command line client that you get from CollabNet, without the hassle of downloading it.
Joey
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