ΔE 9.6, close: similar, with a visible difference side by side. Blue Green is more muted, warmer than Duck Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Blue Green is more muted, warmer than Duck Blue.
The same difference applies the other way round: Duck Blue is more saturated, 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 Duck Blue on the colour wheel See Blue Green on the colour wheel
All matches: Duck Blue equivalents · Blue Green equivalents