ΔE 9.3, close: similar, with a visible difference side by side. USAF Tan is more saturated, warmer than Charred Bone.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). USAF Tan is more saturated, warmer than Charred Bone.
The same difference applies the other way round: Charred Bone is more muted, 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.
See Charred Bone on the colour wheel See USAF Tan on the colour wheel
All matches: Charred Bone equivalents · USAF Tan equivalents