ΔE 9.7, close: similar, with a visible difference side by side. Moon Mist Grey is a little darker, more muted than Bleached Bone.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Moon Mist Grey is a little darker, more muted than Bleached Bone.
The same difference applies the other way round: Bleached Bone is a little lighter, more saturated.
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 Bleached Bone on the colour wheel See Moon Mist Grey on the colour wheel
All matches: Bleached Bone equivalents · Moon Mist Grey equivalents