I think what you are searching for is DoubleKiller. It's a great program, that runs directly from the executable, meaning to installation is necessary. It allows searching for identical DATES, SIZES, NAMES. It also allows for searching of specific file types, as well as specific attributes including (Read-Only, Hidden, Archive and System).
I will upload the .exe file for you in a .zip folder.
Hope this helps.
P.S.
The program includes a built in help tab.
DoubleKiller.zip