Charred Bone vs Vambrace Brown

How close are they?

ΔE 9.6, close: similar, with a visible difference side by side. Vambrace Brown is a little darker, warmer than Charred Bone.

Can I use Vambrace Brown instead of Charred Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Vambrace Brown is a little darker, warmer than Charred Bone.

Can I use Charred Bone instead of Vambrace Brown?

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

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.