ΔE 8.3, close: similar, with a visible difference side by side. Turquoise is warmer than Nocturne Green. They are different kinds of paint: Citadel Nocturne Green is an opaque base/layer paint and Green Stuff World Turquoise is an ink, glaze or transparent paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Turquoise is warmer than Nocturne Green. They are different kinds of paint.
The same difference applies the other way round: Nocturne Green is cooler.
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 Nocturne Green on the colour wheel See Turquoise on the colour wheel
All matches: Nocturne Green equivalents · Turquoise equivalents