Yes. The new Google Photos detect duplicates when you are uploading photos to your account. Google Photos app can scan your photo library and offer you to delete similar photos for you to free up a storage space on your phone. If the file names of your photos are different and they are reside in different folders of your hard disk, then the Google Photos will still recognize the duplicates and remove them from the upload queue.
Quick Tip Before You Know About New Google Photos that Detects Duplicates
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