Before taking action upon any administrative regulation or change therein the agency shall review and consider any written comments submitted pursuant to section 201¹ and may hold such public hearings as seem appropriate. If the act of Assembly or other authority under which a regulation is proposed to be promulgated, amended or repealed requires the holding of public hearings or establishes other procedures in addition to those prescribed by this Article II,² the agency shall hold public hearings or comply with such other procedures as are not inconsistent with the provisions of this act. The agency text of any administrative regulation or change therein as finally adopted may contain such modifications to the proposed text as published pursuant to section 201 as do not enlarge its original purpose, but modifications which enlarge the original purpose of a proposal as published under section 201 shall be republished thereunder prior to final adoption by the agency.