ΔE 7.1, close: similar, with a visible difference side by side. Dark Purple is more saturated, warmer than Dark Prussian Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Dark Purple is more saturated, warmer than Dark Prussian Blue.
The same difference applies the other way round: Dark Prussian Blue is more muted, 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 Dark Prussian Blue on the colour wheel See Dark Purple on the colour wheel
All matches: Dark Prussian Blue equivalents · Dark Purple equivalents