ΔE 13.6, fair: the same colour family, but not a straight swap. USAF Light Gray is a little darker, more muted than Khaki Highlight.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). USAF Light Gray is a little darker, more muted than Khaki Highlight.
The same difference applies the other way round: Khaki Highlight is a little lighter, more saturated.
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 Khaki Highlight on the colour wheel See USAF Light Gray on the colour wheel
All matches: Khaki Highlight equivalents · USAF Light Gray equivalents