ΔE 15.2, loose: different enough that you should pick on purpose. Stormfiend is a little lighter, cooler than Cloudburst Blue.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Stormfiend is a little lighter, cooler than Cloudburst Blue.
The same difference applies the other way round: Cloudburst Blue is a little darker, warmer.
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 Cloudburst Blue on the colour wheel See Stormfiend on the colour wheel
All matches: Cloudburst Blue equivalents · Stormfiend equivalents