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