You're wrong. Have you actually juxtaposed different state syllabi for the same subject?
I am not entering the discussion/debate, but rather, I am going to point out the differences in the 'equivalent' subjects in Victoria and NSW. From what I have seen there are many differences in the subject content between Victoria and NSW alone. For example, permutations as a topic is 'dropped' at the end of year 11 in Victoria and the geometry that we do is minimal. On the other hand, a lot of the probability that we study is more calculator based - normal distribution. Take physics as another example. In Victoria prac related questions only appear on the school assessment tasks that we do. The physics exams in Victoria place far more emphasis on calculations and the theory that we learn about certain topics. It is very rare for any question, which relates to practical work in labs, to appear on the exam.
The subject content in the different states are distinctly different. I do not see any real point in messing with the current system. If people want to attend university overseas then why are they still studying in Australia? As for the HSC being too easy, I do not see how people can say that. As I see it, the pass rate means close to nothing as basically anyone who puts in at least some effort to study can pass - it is no big deal to pass. From what I have seen, the NSW maths exams are the most difficult in the country so unless there are consistently hundreds of people getting full marks on them then the HSC is far from being too easy.