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