ΔE 10.0, close: similar, with a visible difference side by side. USAAF Light Gray is more muted, cooler than Terran Khaki.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). USAAF Light Gray is more muted, cooler than Terran Khaki.
The same difference applies the other way round: Terran Khaki is more saturated, 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 Terran Khaki on the colour wheel See USAAF Light Gray on the colour wheel
All matches: Terran Khaki equivalents · USAAF Light Gray equivalents