(a) Notwithstanding Section 11425.10 of the Government Code, Chapter 4.5 (commencing with Section 11400) of Part 1 of Division 3 of Title 2 of the Government Code does not apply to a hearing by the board under this part, except a hearing to determine an unfair labor practice charge.
(b) Notwithstanding Sections 11425.30 and 11430.10 of the Government Code, in a hearing to determine an unfair labor practice charge, a person who has participated in a determination of probable cause, injunctive or other pre-hearing relief, or other equivalent preliminary determination in an adjudicative proceeding may serve as presiding officer or as a supervisor of the presiding officer or may assist or advise the presiding officer in the same proceeding.