Pale Yellow vs Toxic Yellow

How close are they?

ΔE 8.5, close: similar, with a visible difference side by side. Toxic Yellow is a little darker, more saturated than Pale Yellow.

Can I use Toxic Yellow instead of Pale Yellow?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Toxic Yellow is a little darker, more saturated than Pale Yellow.

Can I use Pale Yellow instead of Toxic Yellow?

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