Corvus Black vs Steely Blue

How close are they?

ΔE 8.2, close: similar, with a visible difference side by side. Steely Blue is a little lighter, more saturated than Corvus Black.

Can I use Steely Blue instead of Corvus Black?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Steely Blue is a little lighter, more saturated than Corvus Black.

Can I use Corvus Black instead of Steely Blue?

The same difference applies the other way round: Corvus Black is a little darker, 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.