Charred Bone vs Driftwood Brown

How close are they?

ΔE 6.6, close: similar, with a visible difference side by side. Driftwood Brown is a little darker than Charred Bone.

Can I use Driftwood Brown instead of Charred Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Driftwood Brown is a little darker than Charred Bone.

Can I use Charred Bone instead of Driftwood Brown?

The same difference applies the other way round: Charred Bone is a little lighter.

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.