ΔE 13.1, fair: the same colour family, but not a straight swap. Khaki Drill is noticeably darker, cooler than Phoenix Feather.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Khaki Drill is noticeably darker, cooler than Phoenix Feather.
The same difference applies the other way round: Phoenix Feather is noticeably 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 Phoenix Feather on the colour wheel See Khaki Drill on the colour wheel
All matches: Phoenix Feather equivalents · Khaki Drill equivalents