A close analogy Frank but the only difference that should occur between any prelim and the Final is the Final includes analysis of the event,additional facts as they come to light during the investigation(such as CASA audits), any recommendations and contributing factors. Any facts that are stated in the prelim are still the facts unless any actual evidence proves otherwise. So the facts about who was flying at what time should not change. Given what happened over the course of producing the Final report I would suggest the prelim is the more accurate in presenting the facts.