ΔE 8.4, close: similar, with a visible difference side by side. Galvanic Corrosion is a little lighter than T'au Light Ochre. They are different kinds of paint: Citadel T'au Light Ochre is an opaque base/layer paint and Vallejo Galvanic 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 8). Galvanic Corrosion is a little lighter than T'au Light Ochre. They are different kinds of paint.
The same difference applies the other way round: T'au Light Ochre is a little darker.
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 T'au Light Ochre on the colour wheel See Galvanic Corrosion on the colour wheel
All matches: T'au Light Ochre equivalents · Galvanic Corrosion equivalents