ΔE 22.5, loose: different enough that you should pick on purpose. N4 Neutral Gray is noticeably darker, much more muted than Stormfang.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). N4 Neutral Gray is noticeably darker, much more muted than Stormfang.
The same difference applies the other way round: Stormfang is noticeably lighter, much more saturated.
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 N4 Neutral Gray on the colour wheel
All matches: Stormfang equivalents · N4 Neutral Gray equivalents