Cathay Pacific operate two configurations of the A330-300 aircraft. The majority are in 2-class config with regionalo business class. These are the ones they fly into Brisbane.
However, they have 5 of these aircraft in 3-class config, where the business class is basically the same as 747 and 777 long-haul aircraft. Checking the seat availability for a random date in November shows First Class is being sold, hence it is the long-haul varatian of the A330-300 being used.