There's really no way to tell. If those nine questions came mostly from one section, then there's no guarantee that you would get proportionately more questions wrong in a full-scale PS section. Furthermore, scaled scores have to be determined by looking at the "curve" as it applies to a specific test administration. Unless the reference material you're using has a conversion chart, I don't think you can get a scaled score.
Don't concnentrate on that right now, anyway. Focus instead on learning why you got those questions wrong, then study up and take another practice exam.