ΔE 9.9, close: similar, with a visible difference side by side. Corrosion is a little lighter, more muted, warmer than Gal Vorbak Red. They are different kinds of paint: Citadel Gal Vorbak Red is an opaque base/layer paint and Vallejo Corrosion 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 10). Corrosion is a little lighter, more muted, warmer than Gal Vorbak Red. They are different kinds of paint.
The same difference applies the other way round: Gal Vorbak Red is a little darker, 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 Gal Vorbak Red on the colour wheel See Corrosion on the colour wheel
All matches: Gal Vorbak Red equivalents · Corrosion equivalents