ΔE 6.8, close: similar, with a visible difference side by side. Azure is more saturated, warmer than Turnbull Turquoise.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Azure is more saturated, warmer than Turnbull Turquoise.
The same difference applies the other way round: Turnbull Turquoise is 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 Turnbull Turquoise on the colour wheel See Azure on the colour wheel
All matches: Turnbull Turquoise equivalents · Azure equivalents