Right now, I'm pretty sure Emplode doesn't care if you feed it ten files with identical tags. Theoretically, they could change Emplode to warn you if those things were the same as an existing song, then offer to replace/skip the file if you want. Not a bad idea. Put that in the wish list forum.
Failing that, there is a plan to have a "search" box in Emplode soon. I don't know how this box is going to work, but I hope that one of its options will be to display a sortable version of the entire database. Then you could just click on the "title" column and see where all the dupes exist.
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Tony Fabris