ΔE 12.6, fair: the same colour family, but not a straight swap. Brilliant Blue is a little lighter, cooler than Frostveil.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Brilliant Blue is a little lighter, cooler than Frostveil.
The same difference applies the other way round: Frostveil 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 Frostveil on the colour wheel See Brilliant Blue on the colour wheel
All matches: Frostveil equivalents · Brilliant Blue equivalents