Part IV—Adjudicative Proceedings—of chapter 34.05 RCW and the model rules of procedure, chapter 10-08 WAC, adopted by the chief administrative law judge pursuant to RCW 34.05.250, as now or hereafter amended, are hereby adopted for use by the commission. In the case of conflict between chapter 34.05 RCW or the model rules of procedure and procedural rules adopted in this chapter, the procedural rules adopted by the commission shall take precedence.