ΔE 22.7, loose: different enough that you should pick on purpose. Trollslayer Orange is noticeably darker, much more saturated, cooler than Pyrrhic Dawn.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 23). Trollslayer Orange is noticeably darker, much more saturated, cooler than Pyrrhic Dawn.
The same difference applies the other way round: Pyrrhic Dawn is noticeably lighter, much more muted, 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 Pyrrhic Dawn on the colour wheel See Trollslayer Orange on the colour wheel
All matches: Pyrrhic Dawn equivalents · Trollslayer Orange equivalents