ΔE 6.7, close: similar, with a visible difference side by side. Necrolith Bone is a little darker, more muted than Mid Khaki Drill.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Necrolith Bone is a little darker, more muted than Mid Khaki Drill.
The same difference applies the other way round: Mid Khaki Drill 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 Mid Khaki Drill on the colour wheel See Necrolith Bone on the colour wheel
All matches: Mid Khaki Drill equivalents · Necrolith Bone equivalents