ΔE 15.0, fair: the same colour family, but not a straight swap. Dark Grey Blue is a little darker, more muted, warmer than Abyssal Blue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Dark Grey Blue is a little darker, more muted, warmer than Abyssal Blue.
The same difference applies the other way round: Abyssal Blue is a little lighter, more saturated, 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 Abyssal Blue on the colour wheel See Dark Grey Blue on the colour wheel
All matches: Abyssal Blue equivalents · Dark Grey Blue equivalents