Prussian Blue Hue vs Dark Blue

How close are they?

ΔE 13.8, fair: the same colour family, but not a straight swap. Dark Blue is noticeably lighter, more saturated than Prussian Blue Hue.

Can I use Dark Blue instead of Prussian Blue Hue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Dark Blue is noticeably lighter, more saturated than Prussian Blue Hue.

Can I use Prussian Blue Hue instead of Dark Blue?

The same difference applies the other way round: Prussian Blue Hue is noticeably darker, more muted.

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.