ΔE 6.9, close: similar, with a visible difference side by side. Skin Tone is a little lighter, warmer than Grimy Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Skin Tone is a little lighter, warmer than Grimy Grey.
The same difference applies the other way round: Grimy Grey is a little darker, 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 Grimy Grey on the colour wheel See Skin Tone on the colour wheel
All matches: Grimy Grey equivalents · Skin Tone equivalents