ΔE 8.8, close: similar, with a visible difference side by side. Ultramarine Blue is warmer than Mediterranean Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Ultramarine Blue is warmer than Mediterranean Blue.
The same difference applies the other way round: Mediterranean 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 Mediterranean Blue on the colour wheel See Ultramarine Blue on the colour wheel
All matches: Mediterranean Blue equivalents · Ultramarine Blue equivalents