ΔE 10.6, fair: the same colour family, but not a straight swap. Frostheart is more muted, cooler than Tidal Wave.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Frostheart is more muted, cooler than Tidal Wave.
The same difference applies the other way round: Tidal Wave is more saturated, 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 Tidal Wave on the colour wheel See Frostheart on the colour wheel
All matches: Tidal Wave equivalents · Frostheart equivalents