ΔE 11.8, fair: the same colour family, but not a straight swap. Ironhull Grey is a little lighter, more muted than Stormfang.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Ironhull Grey is a little lighter, more muted than Stormfang.
The same difference applies the other way round: Stormfang is a little darker, 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 Ironhull Grey on the colour wheel
All matches: Stormfang equivalents · Ironhull Grey equivalents