The two most glaring:
Ranfurlie not ranked at all on AGD, on GA its 60
West Australian not ranked at all on GA, on AGD its 56
The common theme in a lot of these seems to be GA ranks a lot of Victoria courses higher than AGD does. Some state based biases here one way or another?
I think the GA ranking panel is around 40-50 people where the AGD is around 180 spread all over the Australia in an attempt to get a more accurate snap shot of the less visited courses.
The GA panel may have a large percentage of their panel in major cities.