Light Khaki Drill vs Sickly Skin

How close are they?

ΔE 16.0, loose: different enough that you should pick on purpose. Sickly Skin is noticeably lighter, more saturated, cooler than Light Khaki Drill.

Can I use Sickly Skin instead of Light Khaki Drill?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Sickly Skin is noticeably lighter, more saturated, cooler than Light Khaki Drill.

Can I use Light Khaki Drill instead of Sickly Skin?

The same difference applies the other way round: Light Khaki Drill is noticeably darker, more muted, 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.