ΔE 6.5, close: similar, with a visible difference side by side. Turquoise Ink is a little lighter, cooler than Thunder Storm. They are different kinds of paint: Army Painter Thunder Storm is an opaque base/layer paint and Nocturna Models Turquoise Ink 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 6). Turquoise Ink is a little lighter, cooler than Thunder Storm. They are different kinds of paint.
The same difference applies the other way round: Thunder Storm is a little darker, 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.
See Thunder Storm on the colour wheel See Turquoise Ink on the colour wheel
All matches: Thunder Storm equivalents · Turquoise Ink equivalents