Sorry but I don't really think I understand your question or what you are trying to do.
I do know that Administrators, Content Administrators, and Role Administrators are special system roles in mojoPortal. You cannot make other roles the same as those roles. If you want to allow someone to manage roles you would have to add them to the Role Administrators role you cannot make a different role have all the same permissions as Role Administrator because Role Administrators is a special role with permissions to manage roles.
If you want a user to be able to create users and manage their roles, then you must add the user to the Role Administrators role and either add the Role Administrators role to the permission for Roles That Can Manage Users, or create a custom role with that permission and also add the user to the custom role, but the only way they can manage user roles is by adding them to Role Administrators.
Also keep in mind that if you add a user to a role or remove him from a role, the user must log out and login again to get the new role cookie.