ΔE 22.1, loose: different enough that you should pick on purpose. Ray Gun Glow is noticeably lighter, much more saturated, warmer than Stormfang.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 22). Ray Gun Glow is noticeably lighter, much more saturated, warmer than Stormfang.
The same difference applies the other way round: Stormfang is noticeably darker, much more muted, 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 Ray Gun Glow on the colour wheel
All matches: Stormfang equivalents · Ray Gun Glow equivalents