I know of no method for doing this. The original template  is just a starting
point for the creation of a Site. Once created  any number of Lists,
Libraries, features and additional sites could be added to it. You could
start with a blank site  template and by the time you are done, have a site
that looked as if you created it with the Collaboration template.

Actually, you could 'save site  as template', open the .stp file with
winzip, and look in the xml file. It will list the originating site
definition. There was a thread on this a while back, but I only have
email at the moment.