The Australian women weren’t property that could be raped at will by their owners. Their children could not be taken away from them and sold like cattle. The men could not be castrated and mutilated by owners, or even killed at will the way people slaughter animals.
Just s few of the differences that you have overlooked.
Perhaps tou should more history. It was that bad and worse. Here is an example.
“Convicts who attempted to escape were sent to tiny Norfolk Island, 600 miles east of Australia, where the conditions were even more inhumane. The only hope of escape from the horror of Norfolk Island was a “game” in which groups of three prisoners drew straws. The short straw was killed as painlessly as possible and a judge was then shipped in to put the other two on trial, one playing the role of killer, the other as witness.”