Light Ghost Gray vs Russ. AF Light Blue

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Russ. AF Light Blue is more saturated, warmer than Light Ghost Gray.

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

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Russ. AF Light Blue is more saturated, warmer than Light Ghost Gray.

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

The same difference applies the other way round: Light Ghost Gray is more muted, cooler.

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.