The hard part isn't the loan
It's the timing. Sell first and you may need somewhere to live for a few months. Buy first and you're carrying two mortgages. Most people upgrading in Dubbo are trying to line up two settlements at once, and that's where it comes unstuck.
There's no single right answer. It depends on how much equity you have, how quickly your current place is likely to sell, and how much risk you're comfortable with.