Space Grey vs UK Azure Blue

How close are they?

ΔE 13.3, fair: the same colour family, but not a straight swap. UK Azure Blue is much more saturated, warmer than Space Grey.

Can I use UK Azure Blue instead of Space Grey?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). UK Azure Blue is much more saturated, warmer than Space Grey.

Can I use Space Grey instead of UK Azure Blue?

The same difference applies the other way round: Space Grey is much more muted, 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.