Cobalt Blue vs Gunmetal

How close are they?

ΔE 14.7, fair: the same colour family, but not a straight swap. Gunmetal is a little lighter, more muted than Cobalt Blue.

Can I use Gunmetal instead of Cobalt Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Gunmetal is a little lighter, more muted than Cobalt Blue.

Can I use Cobalt Blue instead of Gunmetal?

The same difference applies the other way round: Cobalt Blue is a little darker, more saturated.

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.