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