ΔE 6.5, close: similar, with a visible difference side by side. Sunset Orange is a little lighter than Bright Orange.
Usually, if you are not matching paint already on the model. Close match (ΔE 7). Sunset Orange is a little lighter than Bright Orange.
The same difference applies the other way round: Bright Orange is a little darker.
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.
See Bright Orange on the colour wheel See Sunset Orange on the colour wheel
All matches: Bright Orange equivalents · Sunset Orange equivalents