ΔE 6.3, close: similar, with a visible difference side by side. Turquoise is warmer than Star Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Turquoise is warmer than Star Blue.
The same difference applies the other way round: Star Blue 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 Star Blue on the colour wheel See Turquoise on the colour wheel
All matches: Star Blue equivalents · Turquoise equivalents