Russian Green (4BO) vs Dark Green

How close are they?

ΔE 10.4, fair: the same colour family, but not a straight swap. Dark Green is a little darker, more saturated, cooler than Russian Green (4BO).

Can I use Dark Green instead of Russian Green (4BO)?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Dark Green is a little darker, more saturated, cooler than Russian Green (4BO).

Can I use Russian Green (4BO) instead of Dark Green?

The same difference applies the other way round: Russian Green (4BO) is a little lighter, more muted, 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.