ΔE 11.1, fair: the same colour family, but not a straight swap. Flak Gun Yellow is more muted, cooler than Yellow Dune.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Flak Gun Yellow is more muted, cooler than Yellow Dune.
The same difference applies the other way round: Yellow Dune is more saturated, warmer.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Yellow Dune on the colour wheel See Flak Gun Yellow on the colour wheel
All matches: Yellow Dune equivalents · Flak Gun Yellow equivalents