ΔE 6.8, close: similar, with a visible difference side by side. Red is a little darker than Baal Red. They are different kinds of paint: Citadel Baal Red is a one-coat contrast-style paint and Green Stuff World Red 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 7). Red is a little darker than Baal Red. They are different kinds of paint.
The same difference applies the other way round: Baal Red is a little lighter.
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 Baal Red on the colour wheel See Red on the colour wheel
All matches: Baal Red equivalents · Red equivalents