Different between "throw away" & "throw away if duplicate"?

When moving a file, what's the difference between "If file exists: throw the file away" and "Throw away the duplicate"?

I answered this in your other thread but "If file exists" just means a file with the same name (not necessarily the same contents), while "duplicate" means a file with the same contents (and a similar name).

Yes, you did. Thanks!
k.