ΔE 18.8, loose: different enough that you should pick on purpose. Fluorescent Orange is more saturated, warmer than Red Ecstasy.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Fluorescent Orange is more saturated, warmer than Red Ecstasy.
The same difference applies the other way round: Red Ecstasy is more muted, cooler.
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 Red Ecstasy on the colour wheel See Fluorescent Orange on the colour wheel
All matches: Red Ecstasy equivalents · Fluorescent Orange equivalents