ΔE 8.8, close: similar, with a visible difference side by side. Blue is a little lighter, more muted, warmer than Imperial Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Blue is a little lighter, more muted, warmer than Imperial Blue.
The same difference applies the other way round: Imperial Blue is a little darker, 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 Imperial Blue on the colour wheel See Blue on the colour wheel
All matches: Imperial Blue equivalents · Blue equivalents