Deep Ocean Blue vs Incubi Darkness

How close are they?

ΔE 8.2, close: similar, with a visible difference side by side. Incubi Darkness is more saturated, cooler than Deep Ocean Blue.

Can I use Incubi Darkness instead of Deep Ocean Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Incubi Darkness is more saturated, cooler than Deep Ocean Blue.

Can I use Deep Ocean Blue instead of Incubi Darkness?

The same difference applies the other way round: Deep Ocean Blue is more muted, 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.