ΔE 17.3, loose: different enough that you should pick on purpose. Yriel Yellow is a little darker, more muted, warmer than Yellow Fluor. They are different kinds of paint: AK Interactive Yellow Fluor is a fluorescent or effect paint and Citadel Yriel Yellow is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Yriel Yellow is a little darker, more muted, warmer than Yellow Fluor. They are different kinds of paint.
The same difference applies the other way round: Yellow Fluor is a little lighter, more saturated, 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 Yellow Fluor on the colour wheel See Yriel Yellow on the colour wheel
All matches: Yellow Fluor equivalents · Yriel Yellow equivalents