ΔE 13.0, fair: the same colour family, but not a straight swap. Midnight Purple is a little darker, more muted, warmer than Prussian Blue Hue.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Midnight Purple is a little darker, more muted, warmer than Prussian Blue Hue.
The same difference applies the other way round: Prussian Blue Hue is a little lighter, more saturated, 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 Prussian Blue Hue on the colour wheel See Midnight Purple on the colour wheel
All matches: Prussian Blue Hue equivalents · Midnight Purple equivalents