Russian Blue vs Nocturne Green

How close are they?

ΔE 10.9, fair: the same colour family, but not a straight swap. Nocturne Green is a little darker, more saturated than Russian Blue.

Can I use Nocturne Green instead of Russian Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Nocturne Green is a little darker, more saturated than Russian Blue.

Can I use Russian Blue instead of Nocturne Green?

The same difference applies the other way round: Russian Blue is a little lighter, more muted.

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.