I'm wondering if the one on the VTF is one of the late SIIa six cylinders (suffix e 1969) which were sandstone, a light creamy yellow colour which would appear white in monochrome prints. The Holdens seem to be HT (1969-1970) so that would be the correct time period.
The one in the yard is certainly different, being a mil. spec SIIa with cut mudguards.
On the Inter drill rigs. There is one in the SME and I believe it is a Vet, so likely one of those two.
Diana