ΔE 9.0, close: similar, with a visible difference side by side. Ushabti Bone is more saturated than Skeleton Bone.
✓ Army Painter Fanatic conversion chart lists these two as equivalents.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Ushabti Bone is more saturated than Skeleton Bone.
The same difference applies the other way round: Skeleton 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.
See Skeleton Bone on the colour wheel See Ushabti Bone on the colour wheel
All matches: Skeleton Bone equivalents · Ushabti Bone equivalents