mysqldbcompare SELECT command denied to user
You should enable the dbuser to have READ permissions to the proc table.


  The process attempts to perform a SELECT statement on the 'proc'
  table.  The 'proc' table is a system table which retains the
  procedures of all users on that mysql instance.  On shared hosting,
  allowing userA to see the procedures of userB, which would include
  information about table structure, etc., would be considered breach of
  security.All info found here


Or you can use the root user.