Cost of living in Wollongong (Australia) is 12% cheaper than in Al Mubarraz (Saudi Arabia)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 87 prices entered by 8 different people.
For example, to keep the same standard of living that would require ﷼ 14,000 in Al Mubarraz you would need to make just about ﷼ 12,334 (AU$4,566) in Wollongong.