ΔE 12.2, fair: the same colour family, but not a straight swap. Smoke Gray is noticeably lighter, more muted than Ashroot.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Smoke Gray is noticeably lighter, more muted than Ashroot.
The same difference applies the other way round: Ashroot is noticeably 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.
See Ashroot on the colour wheel See Smoke Gray on the colour wheel
All matches: Ashroot equivalents · Smoke Gray equivalents