ΔE 8.1, close: similar, with a visible difference side by side. IDF Gray 1 (-1981 Sinai) is a little darker, warmer than Ushabti Bone.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). IDF Gray 1 (-1981 Sinai) is a little darker, warmer than Ushabti Bone.
The same difference applies the other way round: Ushabti 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.
See Ushabti Bone on the colour wheel See IDF Gray 1 (-1981 Sinai) on the colour wheel
All matches: Ushabti Bone equivalents · IDF Gray 1 (-1981 Sinai) equivalents