ΔE 6.3, close: similar, with a visible difference side by side. Green Rust is warmer than Gauss Blaster Green. They are different kinds of paint: Citadel Gauss Blaster Green is an opaque base/layer paint and Vallejo Green Rust 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 6). Green Rust is warmer than Gauss Blaster Green. They are different kinds of paint.
The same difference applies the other way round: Gauss Blaster Green is 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 Gauss Blaster Green on the colour wheel See Green Rust on the colour wheel
All matches: Gauss Blaster Green equivalents · Green Rust equivalents