If you want Duplicate Photo Cleaner to give you broader results, go to Settings and select "Use grayscale comparison". This will make Duplicate Photo Cleaner disregard colors.
And if you want to change the scan mode to Same Subject Scan, Photos Scan, Sector Detail Scan, Lightroom Scan or Folder Comparison, use the Scan Mode drop-down menu in the top right corner. You can also connect your smartphone to your computer and manage photos on it with the help of Media Device Scan.
See, managing your photos couldn't be any easier! Run a scan like this every time you upload photos to your computer and your photo library will stay organized.