ΔE 12.4, fair: the same colour family, but not a straight swap. Cement Grey is cooler than Bright Brown Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Cement Grey is cooler than Bright Brown Grey.
The same difference applies the other way round: Bright Brown Grey is warmer.
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 Bright Brown Grey on the colour wheel See Cement Grey on the colour wheel
All matches: Bright Brown Grey equivalents · Cement Grey equivalents