Nocturne Green vs Dark Gray 2

How close are they?

ΔE 10.2, fair: the same colour family, but not a straight swap. Dark Gray 2 is a little lighter, more muted than Nocturne Green.

Can I use Dark Gray 2 instead of Nocturne Green?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Dark Gray 2 is a little lighter, more muted than Nocturne Green.

Can I use Nocturne Green instead of Dark Gray 2?

The same difference applies the other way round: Nocturne Green is a little 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.