ΔE 8.2, close: similar, with a visible difference side by side. Blue is a little lighter, warmer than Imperial Navy.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Blue is a little lighter, warmer than Imperial Navy.
The same difference applies the other way round: Imperial Navy is a little darker, 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 Navy on the colour wheel See Blue on the colour wheel
All matches: Imperial Navy equivalents · Blue equivalents