Stormcover Grey vs Dark Grey Blue

How close are they?

ΔE 6.0, close: similar, with a visible difference side by side. Dark Grey Blue is more saturated than Stormcover Grey.

Can I use Dark Grey Blue instead of Stormcover Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Dark Grey Blue is more saturated than Stormcover Grey.

Can I use Stormcover Grey instead of Dark Grey Blue?

The same difference applies the other way round: Stormcover Grey is more muted.

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.