I just had a look at The Insider Vs Nominations shows and the credits for both shows have the standard BBAU Produced on location in Queensland, Australia (with the assistance of... etc)
But I had a look and both shows' credits...
Insider: Facilities and Crew provided by Network TEN
Nominations: Facilities and Crew provided by Global Television
and a couple of the roles to see if they shared any crew. Not very exhaustive I admit:
Lighting Director: Peter Koole (Insider) Vs Paul Gilfeather (Nominations)
Makeup and Hair: Jodie Oarth, Machiki Hughes, Melinda Wain (Insiders) Vs Abigail Johnstone and Melinda Busk (Nominations)
So no crossover in those couple of roles. But I think the Facilities and Crew really suggests The Insider could well have been taped in Sydney at Pyrmont.