ΔE 14.0, fair: the same colour family, but not a straight swap. Prussian Blue Hue is noticeably darker, warmer than Blue Tone. They are different kinds of paint: Army Painter Blue Tone is a wash/shade and Golden Prussian Blue Hue is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Prussian Blue Hue is noticeably darker, warmer than Blue Tone. They are different kinds of paint.
The same difference applies the other way round: Blue Tone is noticeably lighter, 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 Blue Tone on the colour wheel See Prussian Blue Hue on the colour wheel
All matches: Blue Tone equivalents · Prussian Blue Hue equivalents