How to find dupes in Photos library and a download folder with images?

I moved hundreds of images from an old/dying external drive - into my Mac Studio 'download' folder. I think many or some of them exist already in my Photos library. What app (PowerPhotos or other) can scan both locations for duplicates? Thanks    submitted by   https://www.reddit.com/user/Silverlaker39


https://www.reddit.com/r/macapps/comments/1g5rhuh/how_to_find_dupes_in_photos_library_and_a/