Naphthol Red Light vs Inferno Red

How close are they?

ΔE 8.5, close: similar, with a visible difference side by side. Inferno Red is more muted than Naphthol Red Light.

Can I use Inferno Red instead of Naphthol Red Light?

Usually, if you are not matching paint already on the model. Close match (ΔE 8). Inferno Red is more muted than Naphthol Red Light.

Can I use Naphthol Red Light instead of Inferno Red?

The same difference applies the other way round: Naphthol Red Light 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.