Doesn't look like Oz uses PANS OPS II for alternate minima.
On the east side of the Tasman it's quite simple, the same minima requirements for having an alternate apply for all airports.
If the cloud base is less than 1000 feet above MDA/DA and or (the greater of) vis less than 5000m or less than 1000m more than required viz for that approach then an alternate must be nominated.
The wx requirements for an airport to be suitable to be used as an alternate are listed separately.