WWI French Artillery Grey vs Iron Wolf

How close are they?

ΔE 6.3, close: similar, with a visible difference side by side. Iron Wolf is a little darker, more saturated, cooler than WWI French Artillery Grey.

Can I use Iron Wolf instead of WWI French Artillery Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Iron Wolf is a little darker, more saturated, cooler than WWI French Artillery Grey.

Can I use WWI French Artillery Grey instead of Iron Wolf?

The same difference applies the other way round: WWI French Artillery Grey is a little lighter, more muted, warmer.

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.