ΔE 18.9, loose: different enough that you should pick on purpose. Evil Root is much more muted, cooler than Fire Giant Orange.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Evil Root is much more muted, cooler than Fire Giant Orange.
The same difference applies the other way round: Fire Giant Orange is much more saturated, 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 Fire Giant Orange on the colour wheel See Evil Root on the colour wheel
All matches: Fire Giant Orange equivalents · Evil Root equivalents