I can confirm both discs work in Australia. 4k being region free by default, the Blu-ray is published by universal which is generally without region locking, but I have tested both discs on my player.
Important considering this Oscar-nominated release starring Australian actress Cate Blanchett filmed in 4k with a Dolby Atmos soundtrack about the pursuit of musical perfection featuring several scenes with shadows and high contrast visuals was, of course released locally on a DVD for our broadly uncaring, anti-intellectual market 🤗
That aside, this 4k disc looks and sounds great
Beautifully photographed movie warranting a 4K watch. Pity the movie is self-consciously pretentious with unredeemable characters.