It’s easy to confuse the flags of Australia and Aotearoa New Zealand if your eyes don’t know what to look for.
I had always distinguished between the two by the colour of the stars in the Southern Cross, but that’s sometimes hard to tell at low resolution. There’s a much easier way to tell them apart: AUS has a giant extra star in the lower left quadrant.
AUS 🇦🇺
NZL 🇳🇿