(a) A provision of this part, insofar as it is substantially the same as a previously existing provision relating to the same subject matter, shall be considered as a restatement and continuation of the previously existing provision and not as a new enactment.
(b) A reference in a statute or regulation to a previously existing provision that is restated and continued in this part shall, unless a contrary intent appears, be deemed a reference to the restatement and continuation.
(c) A reference in a statute or regulation to a provision of this part that is substantially the same as a previously existing provision, shall, unless a contrary intent appears, be deemed to include a reference to the previously existing provision.
(d) A reference in a regulation to a provision of former Chapter 6.8 (commencing with Section 25300) of Division 20, rather than to the provision of this part that continues the former provision, has no effect on the validity of the regulation.