ΔE 35.5, loose: different enough that you should pick on purpose. Khaki Drill is noticeably darker, much more saturated, warmer than Phoenix Egg.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 35). Khaki Drill is noticeably darker, much more saturated, warmer than Phoenix Egg.
The same difference applies the other way round: Phoenix Egg is noticeably lighter, much more muted, 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 Phoenix Egg on the colour wheel See Khaki Drill on the colour wheel
All matches: Phoenix Egg equivalents · Khaki Drill equivalents