As a customer, why would I assume this? It's one thing for an Australian cheese maker to write 'feta' on their product because they think it's similar enough to the Greek cheese and another of it actually being similar.

As a customer the only way to find out would be to buy it and try it out. I don't want to have to go through the fine print on the packaging when all I want is some feta cheese for my greek salad.

For the record, I usually buy Turkish sheep's milk cheese because I like it better than feta cheese, but I very much prefer that those are clearly labelled differently so I can tell them apart.