Serpent Eye Yellow vs Light Yellow

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Light Yellow is more muted than Serpent Eye Yellow.

Can I use Light Yellow instead of Serpent Eye Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Light Yellow is more muted than Serpent Eye Yellow.

Can I use Serpent Eye Yellow instead of Light Yellow?

The same difference applies the other way round: Serpent Eye Yellow is 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.