Charred Bone vs US Earth Yellow

How close are they?

ΔE 8.3, close: similar, with a visible difference side by side. US Earth Yellow is more saturated than Charred Bone.

Can I use US Earth Yellow instead of Charred Bone?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). US Earth Yellow is more saturated than Charred Bone.

Can I use Charred Bone instead of US Earth Yellow?

The same difference applies the other way round: Charred Bone is more muted.

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.