ΔE 8.5, close: similar, with a visible difference side by side. Haze Gray is a little darker, warmer than Stormfang.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Haze Gray is a little darker, warmer than Stormfang.
The same difference applies the other way round: Stormfang 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 Stormfang on the colour wheel See Haze Gray on the colour wheel
All matches: Stormfang equivalents · Haze Gray equivalents