Light Earth vs Ushabti Bone

How close are they?

ΔE 6.9, close: similar, with a visible difference side by side. Ushabti Bone is a little lighter, cooler than Light Earth.

Can I use Ushabti Bone instead of Light Earth?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Ushabti Bone is a little lighter, cooler than Light Earth.

Can I use Light Earth instead of Ushabti Bone?

The same difference applies the other way round: Light Earth 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.