Dark Turquoise vs Nocturne Green

How close are they?

ΔE 13.6, fair: the same colour family, but not a straight swap. Nocturne Green is noticeably darker, more muted, cooler than Dark Turquoise.

Can I use Nocturne Green instead of Dark Turquoise?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Nocturne Green is noticeably darker, more muted, cooler than Dark Turquoise.

Can I use Dark Turquoise instead of Nocturne Green?

The same difference applies the other way round: Dark Turquoise is noticeably lighter, more saturated, 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.