ΔE 8.9, close: similar, with a visible difference side by side. Benzimidazolone Yellow Medium is a little darker, more muted than Flash Gitz Yellow. They are different kinds of paint: Citadel Flash Gitz Yellow is an opaque base/layer paint and Golden Benzimidazolone Yellow Medium is an ink, glaze or transparent 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). Benzimidazolone Yellow Medium is a little darker, more muted than Flash Gitz Yellow. They are different kinds of paint.
The same difference applies the other way round: Flash Gitz Yellow is a little lighter, 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 Flash Gitz Yellow on the colour wheel See Benzimidazolone Yellow Medium on the colour wheel
All matches: Flash Gitz Yellow equivalents · Benzimidazolone Yellow Medium equivalents