I'm pretty sure VH SBO is a DC3... I've flown in it in the 60s.
You are correct, but.......
VH-SBO was originally a DHC3 Sea Otter until ditched April 14, 1961.
The DC3 you flew on was originally VH-AEU with TAA from June 11, 1944 until January 10, 1962, when it became VH-SBO "Goroka" - nine months after the Sea Otter ditched.
DC3 VH-SBO went on to become P2-SBO with TAA Sunbird Services and P2-ANT with PX. It was converted to a tour liner configuration by PX in June 1975. On January 18, 1979 it again became VH-SBO. Cancelled from the Australian Register in 1981 and badly damaged in a suicidal pilot crash at Bankstown September 15, 1982.