ΔE 8.4, close: similar, with a visible difference side by side. Trollslayer Orange is a little lighter, more muted than Orange Fluor. They are different kinds of paint: AK Interactive Orange Fluor is a fluorescent or effect paint and Citadel Trollslayer Orange is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Usually, if you are not matching paint already on the model. Close match (ΔE 8). Trollslayer Orange is a little lighter, more muted than Orange Fluor. They are different kinds of paint.
The same difference applies the other way round: Orange Fluor is a little darker, more saturated.
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 Orange Fluor on the colour wheel See Trollslayer Orange on the colour wheel
All matches: Orange Fluor equivalents · Trollslayer Orange equivalents