ΔE 27.8, loose: different enough that you should pick on purpose. Trollslayer Orange is a little lighter, warmer than Blood Red Skies.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Trollslayer Orange is a little lighter, warmer than Blood Red Skies.
The same difference applies the other way round: Blood Red Skies is a little darker, 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 Blood Red Skies on the colour wheel See Trollslayer Orange on the colour wheel
All matches: Blood Red Skies equivalents · Trollslayer Orange equivalents