ΔE 14.1, fair: the same colour family, but not a straight swap. Flat Blue is much more saturated, warmer than Abyss Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Flat Blue is much more saturated, warmer than Abyss Blue.
The same difference applies the other way round: Abyss Blue is 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 Abyss Blue on the colour wheel See Flat Blue on the colour wheel
All matches: Abyss Blue equivalents · Flat Blue equivalents