Weathered Blue vs USAF Light Blue

How close are they?

ΔE 10.8, fair: the same colour family, but not a straight swap. USAF Light Blue is a little darker, more muted than Weathered Blue.

Can I use USAF Light Blue instead of Weathered Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). USAF Light Blue is a little darker, more muted than Weathered Blue.

Can I use Weathered Blue instead of USAF Light Blue?

The same difference applies the other way round: Weathered Blue 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.