Bone Brown vs Charred Bone

How close are they?

ΔE 7.7, close: similar, with a visible difference side by side. Charred Bone is a little lighter, cooler than Bone Brown.

Can I use Charred Bone instead of Bone Brown?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Charred Bone is a little lighter, cooler than Bone Brown.

Can I use Bone Brown instead of Charred Bone?

The same difference applies the other way round: Bone Brown 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.