ΔE 20.4, loose: different enough that you should pick on purpose. Radiant Orange is noticeably darker, warmer than Fyreslayer Flesh.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Radiant Orange is noticeably darker, warmer than Fyreslayer Flesh.
The same difference applies the other way round: Fyreslayer Flesh is noticeably lighter, 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 Fyreslayer Flesh on the colour wheel See Radiant Orange on the colour wheel
All matches: Fyreslayer Flesh equivalents · Radiant Orange equivalents