FIM Attributes for differences: 

• isDir
• file size
• creation time
• modification time
• permissions (read write execute)
• group owner   
• user owner    
• hash of whole file if it is under 5MB in size ( or if it is bigger than 5MB,  the hash of 20 blocks of 4096 bytes evenly spaced including first and last blocks of the file )
• isSymLink