AE-9/AII Light Grey vs Liquid Mask

How close are they?

ΔE 5.5, very close: most people won’t see a difference side by side. Liquid Mask is a little lighter, more muted than AE-9/AII Light Grey.

Can I use Liquid Mask instead of AE-9/AII Light Grey?

Yes, for most jobs. Very close match (ΔE 5). Liquid Mask is a little lighter, more muted than AE-9/AII Light Grey.

Can I use AE-9/AII Light Grey instead of Liquid Mask?

The same difference applies the other way round: AE-9/AII Light Grey is a little darker, 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.