ΔE 10.1, fair: the same colour family, but not a straight swap. Ocean Gray is a little lighter, more saturated than Dark Concrete.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Ocean Gray is a little lighter, more saturated than Dark Concrete.
The same difference applies the other way round: Dark Concrete is a little darker, more muted.
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 Concrete on the colour wheel See Ocean Gray on the colour wheel
All matches: Dark Concrete equivalents · Ocean Gray equivalents