Yes, all the Australian assembled Chevs and Vauxhalls used Holden paint colours of the era but the equivalent model in the US or England had a completely different colour range. The Belair pictured is an apparent exception where Australia seems to have adopted the US colour for some of the Australian models. I know very little about paint colour selection or market responses so it is difficult to surmise why the Australian colours were so different to GM. It is very interesting reading some of the Sales Bulletins advising that some colours have been dropped due to unpopularity or another colour has been very popular. Take the Yellow and Black FC for instance, it was a 1st release colour scheme but was very unpopular and was dropped immediately never to return.
You could spend years studying paint colours I reckon
Ken