The system of accounts and the forms of accounts, records, and memoranda prescribed by the commission for corporations subject to the regulatory authority of the United States, shall not be inconsistent with the systems and forms from time to time established for such corporations by or under the authority of the United States. Nothing in this section or Section 794 shall affect the power of the commission to prescribe forms of accounts, records, and memoranda covering information in addition to that required by or under the authority of the United States.