Yes, you could always preview the duplicate files you are about to delete. You could open the file to preview and check the contents.You could also view the exact location where the files are located on your device. The duplicate files are not always stored in the same location it may be in a different unwanted location. Here this preview option comes handy for you to decide which file to keep and which one to delete.
Remo Duplicate File Remover for Cloud Storage:
Remo Duplicate File Remover for Android: