Apart from the differences 400TT mentioned earlier..I believe a major shortcoming of the aussie screens is the lack of a screw holding that 40mm roll over the top.
My old RMC screen had 4 screws in the side and one on the top of the screen where the 40mm roll over finishes.
There is bu$$a all holding these screens on and that top one I believe is veryyyy important.
Unless ya like eating bugs.