ΔE 8.5, close: similar, with a visible difference side by side. The Fang is a little darker, warmer than Shadow Grey.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). The Fang is a little darker, warmer than Shadow Grey.
The same difference applies the other way round: Shadow Grey is a little lighter, 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 Shadow Grey on the colour wheel See The Fang on the colour wheel
All matches: Shadow Grey equivalents · The Fang equivalents