Dark Grey Blue vs Dark Blue

How close are they?

ΔE 13.4, fair: the same colour family, but not a straight swap. Dark Blue is much more saturated, warmer than Dark Grey Blue.

Can I use Dark Blue instead of Dark Grey Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Dark Blue is much more saturated, warmer than Dark Grey Blue.

Can I use Dark Grey Blue instead of Dark Blue?

The same difference applies the other way round: Dark Grey 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.