ΔE 11.8, fair: the same colour family, but not a straight swap. Flak Gun Yellow is a little darker, cooler than Light DAK Sand.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Flak Gun Yellow is a little darker, cooler than Light DAK Sand.
The same difference applies the other way round: Light DAK Sand is a little lighter, 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 Light DAK Sand on the colour wheel See Flak Gun Yellow on the colour wheel
All matches: Light DAK Sand equivalents · Flak Gun Yellow equivalents