ΔE 10.1, fair: the same colour family, but not a straight swap. 3B Russian Green is a little darker, more muted than Neutral Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). 3B Russian Green is a little darker, more muted than Neutral Grey.
The same difference applies the other way round: Neutral Grey is a little 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 Neutral Grey on the colour wheel See 3B Russian Green on the colour wheel
All matches: Neutral Grey equivalents · 3B Russian Green equivalents