ΔE 9.8, close: similar, with a visible difference side by side. Medium Seagray BS637 is more muted, warmer than Stormfang.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Medium Seagray BS637 is more muted, warmer than Stormfang.
The same difference applies the other way round: Stormfang 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 Stormfang on the colour wheel See Medium Seagray BS637 on the colour wheel
All matches: Stormfang equivalents · Medium Seagray BS637 equivalents