ΔE 18.1, loose: different enough that you should pick on purpose. Fanatic Orange is a little darker, more muted, cooler than Trollslayer Orange.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Fanatic Orange is a little darker, more muted, cooler than Trollslayer Orange.
The same difference applies the other way round: Trollslayer Orange is a little lighter, 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 Trollslayer Orange on the colour wheel See Fanatic Orange on the colour wheel
All matches: Trollslayer Orange equivalents · Fanatic Orange equivalents