DEVONthink will allow you to drag and import new documents, and if there are any duplicates, DEVONthink has tools to help you locate duplicates. Search the “DEVONthink Manual” for “duplicates” to find a lot of references. Start on page 10, I think, to see how duplicates are tagged with a special icon. Also in Menu: Settings → Tab: General → Tab: General tag on or off (your preference) on “stricter recognition of duplicates”.
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