ΔE 10.3, fair: the same colour family, but not a straight swap. Blue is warmer than Dark Blue.
✓ AK 3rd Generation equivalence chart lists these two as equivalents.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Blue is warmer than Dark Blue.
The same difference applies the other way round: Dark Blue is 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 Dark Blue on the colour wheel See Blue on the colour wheel
All matches: Dark Blue equivalents · Blue equivalents