[Observium] Rancid SVN diffs not showing

I set Rancid up with SVN instead, but when I make a change and re-run "rancid-run" there is still only the "Latest" tab in observium. I know that observium only goes into the directory and retrieves the configurations and displays it, but how do I display the older version? Rancid configs need to have identical names to the host devices in observium.... If I point observium to search for configs in "$config['rancid_configs'][] = '/usr/local/rancid/var/networking/configs';" how does it know which is old and new? Or is there something I'm missing?

Thanks in advance for any help! Much appreciated!