ΔE 9.6, close: similar, with a visible difference side by side. Khaki Grey is more muted, warmer than Sinai Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Khaki Grey is more muted, warmer than Sinai Grey.
The same difference applies the other way round: Sinai Grey is more saturated, 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 Sinai Grey on the colour wheel See Khaki Grey on the colour wheel
All matches: Sinai Grey equivalents · Khaki Grey equivalents