Light Gray Green vs Russ. AF Light Blue

How close are they?

ΔE 15.0, fair: the same colour family, but not a straight swap. Russ. AF Light Blue is more muted, cooler than Light Gray Green.

Can I use Russ. AF Light Blue instead of Light Gray Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Russ. AF Light Blue is more muted, cooler than Light Gray Green.

Can I use Light Gray Green instead of Russ. AF Light Blue?

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