Compare Permissions on Two Roles

SELECT * 
FROM 
 PSAUTHITEM APP, 
PSROLECLASS RCA 

WHERE RCA.CLASSID = APP.CLASSID
AND rca.rolename = 'ROLE-1-REPLACE-ME'
-- Change this to "exists" to find permissions that are in role 1 and in role 2
-- Change this to "NOT exists" to find permissions that are in role 1 but not in role 2
AND NOT EXISTS
  (SELECT 1 FROM 
    PSAUTHITEM STU, 
      PSROLECLASS RCS
      WHERE RCS.ROLENAME = 'ROLE-2-REPLACE-ME' 
      and rcs.classid = stu.classid
     AND STU.MENUNAME = APP.MENUNAME
     AND stu.baritemname = app.baritemname 
     AND stu.barname = app.barname 
     AND stu.pnlitemname = app.pnlitemname 
     and stu.displayonly = app.displayonly 
     and stu.authorizedactions = app.authorizedactions);