ΔE 12.7, fair: the same colour family, but not a straight swap. Nazdreg Yellow is more muted, cooler than Light Orange Fluor. They are different kinds of paint: AK Interactive Light Orange Fluor is a fluorescent or effect paint and Citadel Nazdreg Yellow is a one-coat contrast-style paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Nazdreg Yellow is more muted, cooler than Light Orange Fluor. They are different kinds of paint.
The same difference applies the other way round: Light Orange Fluor is more saturated, 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 Light Orange Fluor on the colour wheel See Nazdreg Yellow on the colour wheel
All matches: Light Orange Fluor equivalents · Nazdreg Yellow equivalents