Ash Grey vs Light Gray (IJA)

How close are they?

ΔE 8.0, close: similar, with a visible difference side by side. Light Gray (IJA) is a little lighter, more saturated than Ash Grey.

Can I use Light Gray (IJA) instead of Ash Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Light Gray (IJA) is a little lighter, more saturated than Ash Grey.

Can I use Ash Grey instead of Light Gray (IJA)?

The same difference applies the other way round: Ash Grey is a little darker, 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.