Canvas vs Underhive Ash

How close are they?

ΔE 7.2, close: similar, with a visible difference side by side. Underhive Ash is a little lighter, cooler than Canvas.

Can I use Underhive Ash instead of Canvas?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Underhive Ash is a little lighter, cooler than Canvas.

Can I use Canvas instead of Underhive Ash?

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