ΔE 8.5, close: similar, with a visible difference side by side. Thunderhawk Blue is more muted than Fluorescent Blue. They are different kinds of paint: AK Interactive Fluorescent Blue is a fluorescent or effect paint and Citadel Thunderhawk Blue 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 9). Thunderhawk Blue is more muted than Fluorescent Blue. They are different kinds of paint.
The same difference applies the other way round: Fluorescent Blue is 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 Fluorescent Blue on the colour wheel See Thunderhawk Blue on the colour wheel
All matches: Fluorescent Blue equivalents · Thunderhawk Blue equivalents