ΔE 10.1, fair: the same colour family, but not a straight swap. Pyrrole Orange is a little darker, more saturated than Trollslayer Orange.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Pyrrole Orange is a little darker, more saturated than Trollslayer Orange.
The same difference applies the other way round: Trollslayer Orange is a little lighter, more muted.
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 Pyrrole Orange on the colour wheel
All matches: Trollslayer Orange equivalents · Pyrrole Orange equivalents