Moonstone Grey vs USAAF Light Gray

How close are they?

ΔE 12.8, fair: the same colour family, but not a straight swap. USAAF Light Gray is a little lighter, more saturated than Moonstone Grey.

Can I use USAAF Light Gray instead of Moonstone Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). USAAF Light Gray is a little lighter, more saturated than Moonstone Grey.

Can I use Moonstone Grey instead of USAAF Light Gray?

The same difference applies the other way round: Moonstone Grey is a little darker, more muted.

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.