No they are not. Haven't you checked lately the full cost of a uniformed member? Why do you think DMO hire "Professional Service Providers" such as Engineers at a rate of $220,000+ . (That's what they pay the companies providing the individual).
DMO hire PSP's not because they are cheaper (they aren't) - but because either RAAF cant provide the bodies, doesn't have the expertise and/or experience available for the task; or it is a short term, specific task that cant be done with the DMO workforce available or inneficient / unable to re-deploy staff from other areas.