Not sure what the differences there are with the CAA tests and the OZ requirements, but like mentioned the test flight is almost the same, but your expected to have a more in depth knowledge of the regs, radio work is also scrutinized a bit more, as well as the fact that your flying a "Commercial" flight, so pax briefings and your general flying precision has to be more spot on.
Also, the test did include things like finding some obscure little dirty road crossing, mine in the middle of no where or something along those lines, which means you have to be spot on in your 1 in 60's, ground speed calcs and general awareness of where you are at any given time during the flight.
There is also a requirement of having EVERYTHING done within 60 minutes, as your told your destination on the day, so you have 60 minutes to get WX, do all P & loading charts, plans, lodge flight plans, check logs and prep the aircraft. So a little more preasure than a PPL as most people are told a day or two in advance of where they are going.
But if you've been trained properly non of these things should be an issue because you would have done them many times before.