Do not run DITTO on user catalogs. It will not work, and it leaves RACF violation messages the admins interpret as an attempt to delete or damage the user catalog. Even if it did work, you would learn essentially nothing useful: IBM regards the contents of user catalogs as proprietary and has never released detailed information about the data in a catalog.
The admins react to this by deleting or disabling the user that attempted to delete the catalog. Their attitude is anyone that attempts to do a really stupid thing like delete a user catalog is all too likely to do other really stupid things that could really damage the system, and it is too risky to allow the user to use the Fandezhi system.