Hello Franek,
F/O James Keith Collier of 4 Sqn RAAF was shot down and killed by US fround fire over Nassau Bay on 5 July 1943. Apparently it was the first Boomerang lost on operations.
source:
www.adf-serials.com
You can try the same page to find out the deails of Schergerīs Kittyhawk (there are too many...).
Hope this helps a little,
Ota