That ‘Darwin’ shot was taken at Piva, Bougainville.

The same photo appears on Pacific Wrecks here
http://www.pacificwrecks.com/airfields/png/piva_yoke/1945/rnzaf-f4u-piva.html

I reckon the other shot in post #1 is also likely to be Piva.

I know my Grandfather was on Bougainville , so that may very well be where the corsair and Ventura where photographed 🙂