RNZAF should get the F4U-1A, they had over 400 of them in WW2, and it equipped all their Pacific-based fighter units at the end of the war. Second choice would be P-40, of which they had 297(various models) and achieved almost 5:1 kill ratio.
RAAF should get Spitfire VIII or P-40N-1, plus the Aussie built Beaufighter Mk.21 or Mosquito FB.40.