Faded Orange vs Sunset Orange

How close are they?

ΔE 6.1, close: similar, with a visible difference side by side. Sunset Orange is more saturated than Faded Orange.

Can I use Sunset Orange instead of Faded Orange?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Sunset Orange is more saturated than Faded Orange.

Can I use Faded Orange instead of Sunset Orange?

The same difference applies the other way round: Faded Orange is 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.