Naples Yellow vs IJA Chrome Yellow

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. IJA Chrome Yellow is a little darker than Naples Yellow.

Can I use IJA Chrome Yellow instead of Naples Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). IJA Chrome Yellow is a little darker than Naples Yellow.

Can I use Naples Yellow instead of IJA Chrome Yellow?

The same difference applies the other way round: Naples Yellow is a little lighter.

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.