ΔE 26.8, loose: different enough that you should pick on purpose. Plasma Red is more saturated, cooler than Radiant Orange.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Plasma Red is more saturated, cooler than Radiant Orange.
The same difference applies the other way round: Radiant Orange is 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 Plasma Red on the colour wheel
All matches: Radiant Orange equivalents · Plasma Red equivalents