ΔE 23.7, loose: different enough that you should pick on purpose. Phoenix Orange is much more saturated, cooler than Radiant Orange.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 24). Phoenix Orange is much more saturated, cooler than Radiant Orange.
The same difference applies the other way round: Radiant Orange is much more muted, warmer.
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 Radiant Orange on the colour wheel See Phoenix Orange on the colour wheel
All matches: Radiant Orange equivalents · Phoenix Orange equivalents