The population of Australia is 25M. The population of the US is 328M. That 0.7% could just be the deviation inherent in the smaller population. Similarly, the SEER data only comes from 14 states (1), so there's a sampling problem with the US data. Additionally, this is only for the big 4, so there's another bias. Australia, for example, has an enormous burden of skin cancer relative to the US, so much that the world-recognized leading textbook on skin pathology is written by an Australian dermatopathologist (2, 3)

(1) https://seer.cancer.gov/registries/ (2) https://en.wikipedia.org/wiki/David_Weedon (3) https://www.amazon.com/dp/0702075825/