Compare Folders by simular files

[Robert H. Snow]

Is there a way to search a hard drive resulting in a list of folders, alpha order. Resulting in some type of comparison of files within the folders. I know it can be done but have not found a program.
It would be similar to a Flat View, folders would be listed, Tree.
Example.
Folder: Permit
asd.dbf
asd.dbf

Folder: Permits
asd.dbf

Comparing files in the 2 directories:
Folder: Permits would be 50% when compared to Folder: Permit

By doing this I would have the ability to find the strongest similar folders. Problem in the past I would be deleting folders that might have key files. So bottom line is having a list of similar Named Folders displaying how many duplicates are in the folders, names of duplicates or whatever other info might help control deletes. Using a filter might also be of value.
Bob