ΔE 7.1, close: similar, with a visible difference side by side. Charred Bone is a little lighter, cooler than Earth.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Charred Bone is a little lighter, cooler than Earth.
The same difference applies the other way round: 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.
See Earth on the colour wheel See Charred Bone on the colour wheel
All matches: Earth equivalents · Charred Bone equivalents