Have you mailed directly to university regarding this query? Let us know.But why only two states have elaborated this and not others, thats my point and worry too
How ever for SA, in which i am interested, i have this link where 475 has been placed with 175 and 176, which gives me a bit relief.
What services are you eligible to use? :: Make The Move
And also there is another site where Temporary fees of different class visas is given for Western Australia and there is no mention of 475 here.
Temporary, Dependant and Bridging Visa Holders | studying-at-schools