ΔE 9.9, close: similar, with a visible difference side by side. Ultramarine Blue is a little lighter, warmer than Uniform Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Ultramarine Blue is a little lighter, warmer than Uniform Blue.
The same difference applies the other way round: Uniform Blue is a little darker, 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 Uniform Blue on the colour wheel See Ultramarine Blue on the colour wheel
All matches: Uniform Blue equivalents · Ultramarine Blue equivalents