WWI French Artillery Grey vs USAF Light Blue

How close are they?

ΔE 5.0, very close: most people won’t see a difference side by side. USAF Light Blue is a little lighter, cooler than WWI French Artillery Grey.

Can I use USAF Light Blue instead of WWI French Artillery Grey?

Yes, for most jobs. Very close match (ΔE 5). USAF Light Blue is a little lighter, cooler than WWI French Artillery Grey.

Can I use WWI French Artillery Grey instead of USAF Light Blue?

The same difference applies the other way round: WWI French Artillery Grey is a little darker, 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.