Dark Emerald vs USAF Green

How close are they?

ΔE 11.2, fair: the same colour family, but not a straight swap. USAF Green is a little lighter, more muted than Dark Emerald.

Can I use USAF Green instead of Dark Emerald?

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

Can I use Dark Emerald instead of USAF Green?

The same difference applies the other way round: Dark Emerald is a little darker, 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.