ΔE 6.7, close: similar, with a visible difference side by side. Dark Prussian Blue is a little lighter, warmer than Hive Fleet Purple.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Dark Prussian Blue is a little lighter, warmer than Hive Fleet Purple.
The same difference applies the other way round: Hive Fleet Purple 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 Hive Fleet Purple on the colour wheel See Dark Prussian Blue on the colour wheel
All matches: Hive Fleet Purple equivalents · Dark Prussian Blue equivalents