ΔE 11.9, fair: the same colour family, but not a straight swap. Vampire Fang is a little darker, more muted, warmer than Light Khaki Drill.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Vampire Fang is a little darker, more muted, warmer than Light Khaki Drill.
The same difference applies the other way round: Light Khaki Drill is a little lighter, more saturated, cooler.
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 Khaki Drill on the colour wheel See Vampire Fang on the colour wheel
All matches: Light Khaki Drill equivalents · Vampire Fang equivalents