ΔE 13.0, fair: the same colour family, but not a straight swap. Grayish Blue FS35237 is noticeably darker, warmer than Stormfang.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Grayish Blue FS35237 is noticeably darker, warmer than Stormfang.
The same difference applies the other way round: Stormfang is noticeably 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 Grayish Blue FS35237 on the colour wheel
All matches: Stormfang equivalents · Grayish Blue FS35237 equivalents