While the RAAF instructions for Foliage Green/Earth Brown over Sky Blue was the official scheme , aircraft delivered from overseas were not repainted, as it was a waste to repaint a new aircraft, so aircraft like Beaufighter's, Boston's and Vengeances which arrived in 1942 were operated in the schemes they came in usually Dark Green/Dark Earth over Sky or Sky Grey , aircraft manufactured in Australia were in the official scheme but it wasn't that common on imports.
Even later in the war aircraft like A-20C that came in Sept/Oct 43 despite being in rough condition they were needed so badly that they stayed in the rough Olive Drab over Neutral Grey they were delivered in and only had servicing and mods done before issue to the operational Sqn.