Ahriman Blue vs Ashen Blue

How close are they?

ΔE 9.6, close: similar, with a visible difference side by side. Ashen Blue is more muted, cooler than Ahriman Blue.

Can I use Ashen Blue instead of Ahriman Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Ashen Blue is more muted, cooler than Ahriman Blue.

Can I use Ahriman Blue instead of Ashen Blue?

The same difference applies the other way round: Ahriman Blue is more saturated, 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.