Steel Grey vs Dk Mediterr. Blue

How close are they?

ΔE 8.4, close: similar, with a visible difference side by side. Dk Mediterr. Blue is more saturated, warmer than Steel Grey.

Can I use Dk Mediterr. Blue instead of Steel Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Dk Mediterr. Blue is more saturated, warmer than Steel Grey.

Can I use Steel Grey instead of Dk Mediterr. Blue?

The same difference applies the other way round: Steel Grey 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.