Medium Grey vs Celestra Grey

How close are they?

ΔE 8.0, close: similar, with a visible difference side by side. Celestra Grey is more saturated than Medium Grey.

Can I use Celestra Grey instead of Medium Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Celestra Grey is more saturated than Medium Grey.

Can I use Medium Grey instead of Celestra Grey?

The same difference applies the other way round: Medium Grey is more muted.

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.