Intermediate Blue vs Celestra Grey

How close are they?

ΔE 6.1, close: similar, with a visible difference side by side. Celestra Grey is a little darker, cooler than Intermediate Blue.

Can I use Celestra Grey instead of Intermediate Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Celestra Grey is a little darker, cooler than Intermediate Blue.

Can I use Intermediate Blue instead of Celestra Grey?

The same difference applies the other way round: Intermediate Blue is a little lighter, 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.