ΔE 6.1, close: similar, with a visible difference side by side. Bright Orange is more muted than Pyrrole Orange.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Bright Orange is more muted than Pyrrole Orange.
The same difference applies the other way round: Pyrrole Orange 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.
See Pyrrole Orange on the colour wheel See Bright Orange on the colour wheel
All matches: Pyrrole Orange equivalents · Bright Orange equivalents