Between 40 to 50% of the magazine is the same articles as in the Aussie version, but now that the aussie one is bi monthly, the percentage of "different" articles is probably a bit greater. I particularly enjoy looking through the ads, don't we all, and wishing the prices in there were aussie dollars, don't we all! It also reduces the "time between reads" of all things astro. I contains some stuff that is strictly northern, but they could say the same thing about our magazines.
I sent them an email a couple of days ago asking to change my address to home and said it looks like I have missed the August issue too