ΔE 11.9, fair: the same colour family, but not a straight swap. Dark Concrete is noticeably darker, more muted than Uniform Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Dark Concrete is noticeably darker, more muted than Uniform Grey.
The same difference applies the other way round: Uniform Grey is noticeably lighter, 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.
See Uniform Grey on the colour wheel See Dark Concrete on the colour wheel
All matches: Uniform Grey equivalents · Dark Concrete equivalents