ΔE 10.2, fair: the same colour family, but not a straight swap. Deep Azure is a little lighter, cooler than Turquoise INK. They are different kinds of paint: AK Interactive Turquoise INK is an ink, glaze or transparent paint and Army Painter Deep Azure is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Deep Azure is a little lighter, cooler than Turquoise INK. They are different kinds of paint.
The same difference applies the other way round: Turquoise INK 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 Turquoise INK on the colour wheel See Deep Azure on the colour wheel
All matches: Turquoise INK equivalents · Deep Azure equivalents