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