ΔE 8.7, close: similar, with a visible difference side by side. Aquamarine is a little lighter, more saturated, warmer than Matt Turquoise. They are different kinds of paint: AMMO by Mig Matt Turquoise is an ink, glaze or transparent paint and Army Painter Aquamarine is an opaque base/layer 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 9). Aquamarine is a little lighter, more saturated, warmer than Matt Turquoise. They are different kinds of paint.
The same difference applies the other way round: Matt Turquoise is a little darker, more muted, 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 Matt Turquoise on the colour wheel See Aquamarine on the colour wheel
All matches: Matt Turquoise equivalents · Aquamarine equivalents