ΔE 7.7, close: similar, with a visible difference side by side. Prussian Blue is more saturated, warmer than Shadow Thorn.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Prussian Blue is more saturated, warmer than Shadow Thorn.
The same difference applies the other way round: Shadow Thorn is more muted, 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 Shadow Thorn on the colour wheel See Prussian Blue on the colour wheel
All matches: Shadow Thorn equivalents · Prussian Blue equivalents