(a) The provisions of this part insofar as they are substantially the same as existing statutory provisions relating to the same subject matter shall be construed as restatements and continuations, and not as new enactments.
(b) The provisions of Part 2.1 (commencing with Section 18200) shall govern the construction, installation, maintenance, use, and occupancy of a mobilehome, manufactured home, mobilehome accessory building or structure, commercial coach, factory-built home, or permanent building in a special occupancy park.