Celestra Grey vs Light Grey

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Light Grey is a little darker, more muted than Celestra Grey.

Can I use Light Grey instead of Celestra Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Light Grey is a little darker, more muted than Celestra Grey.

Can I use Celestra Grey instead of Light Grey?

The same difference applies the other way round: Celestra Grey is a little lighter, more saturated.

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.