The powers and duties of each Program are vested in and exercised by: in Montgomery County, the county planning board in consultation with the Montgomery County Historic Preservation Commission; and subject to subsection (b) of this section, in Prince George’s County, the county planning board. In Prince George’s County, the county, by local law, may provide for the historic preservation, outreach and marketing, and maintenance of historic properties activities of the Commission. A local law enacted under paragraph (1) of this subsection shall be consistent with the provisions of this division.