ΔE 7.2, close: similar, with a visible difference side by side. USAAF Light Gray is a little darker, cooler than Bone.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). USAAF Light Gray is a little darker, cooler than Bone.
The same difference applies the other way round: Bone is a little lighter, 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 Bone on the colour wheel See USAAF Light Gray on the colour wheel
All matches: Bone equivalents · USAAF Light Gray equivalents