ΔE 9.3, close: similar, with a visible difference side by side. Alien Purple is more saturated, cooler than Hive Fleet Purple.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Alien Purple is more saturated, cooler than Hive Fleet Purple.
The same difference applies the other way round: Hive Fleet Purple is more muted, warmer.
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 Alien Purple on the colour wheel
All matches: Hive Fleet Purple equivalents · Alien Purple equivalents