ΔE 7.6, close: similar, with a visible difference side by side. IDF Blue is a little darker, cooler than Snow Shadow.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). IDF Blue is a little darker, cooler than Snow Shadow.
The same difference applies the other way round: Snow Shadow is a little lighter, 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 Snow Shadow on the colour wheel See IDF Blue on the colour wheel
All matches: Snow Shadow equivalents · IDF Blue equivalents