Lupercal Green vs Green (USAF)

How close are they?

ΔE 10.9, fair: the same colour family, but not a straight swap. Green (USAF) is more muted, warmer than Lupercal Green.

Can I use Green (USAF) instead of Lupercal Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Green (USAF) is more muted, warmer than Lupercal Green.

Can I use Lupercal Green instead of Green (USAF)?

The same difference applies the other way round: Lupercal Green is more saturated, 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.