ΔE 9.5, close: similar, with a visible difference side by side. Blue is a little lighter, cooler than Deep Blue.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Blue is a little lighter, cooler than Deep Blue.
The same difference applies the other way round: Deep Blue is a little darker, warmer.
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 Deep Blue on the colour wheel See Blue on the colour wheel
All matches: Deep Blue equivalents · Blue equivalents