Deep Ocean Blue vs Greatcoat Grey

How close are they?

ΔE 14.0, fair: the same colour family, but not a straight swap. Greatcoat Grey is noticeably lighter than Deep Ocean Blue.

Can I use Greatcoat Grey instead of Deep Ocean Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Greatcoat Grey is noticeably lighter than Deep Ocean Blue.

Can I use Deep Ocean Blue instead of Greatcoat Grey?

The same difference applies the other way round: Deep Ocean Blue is noticeably darker.

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.