roles

I have two databases, I need to insure that both databases has the same roles.  tables, schemas, views must have the same permissions and privileges. you can say and Identical clones. I can synchronise the roles using these statments

SELECT DISTINCT 'CREATE USER '||usename||';' FROM pg_user;
SELECT 'GRANT '||g.usename||' TO '||u.usename||';' FROM pg_auth_members a JOIN pg_user u ON a.member = u.usesysid JOIN pg_user g ON a.roleid = g.usesysid;
SELECT 'ALTER ROLE '||usename||' WITH SUPERUSER;' FROM pg_user WHERE usesuper;