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