ΔE 7.2, close: similar, with a visible difference side by side. Fluorescent Blue is cooler than Teclis Blue. They are different kinds of paint: Citadel Teclis Blue is an opaque base/layer paint and Vallejo Fluorescent Blue is a fluorescent or effect 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 7). Fluorescent Blue is cooler than Teclis Blue. They are different kinds of paint.
The same difference applies the other way round: Teclis Blue is 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 Teclis Blue on the colour wheel See Fluorescent Blue on the colour wheel
All matches: Teclis Blue equivalents · Fluorescent Blue equivalents