copy the line below to your clipboard, open MC, press ctrl+f then press ctrl+v
~dup=[name] p="special names"
This will first of all list all the duplicate names in your library, and then strip away everything that is not in the special names playlist.
So, every track you see will be from the special names list, but you will know that it has a duplicate somewhere else in the library.
right click a track, locate > advanced > name, will display them.
tedious if the list is long, but that's as close as I can get you atm.
Edit:
You could try this:
Once the list has been compiled from the above search, you could click on the wizard arrow, hover over "more fields.." click on "name"
In the dialogue that displays, make sure that "only show items that match other search criteria" is ticked (I think it defaults that way) and click the "select all" button. Click OK
Now click inside the search box and remove everything to the left of [name]= (ie. ~dup=[name] p="special names")
now the list should show all the duplicate names you're looking for, including those entries that are in the special names list. adding -p="special names" should remove those leaving just the files from the main library.
Did you follow all that? bit convoluted I know, but so far, I can't see a way to automate the task.
-marko.