ΔE 9.4, close: similar, with a visible difference side by side. Green Ink is a little lighter, cooler than Feral Green. They are different kinds of paint: Army Painter Feral Green is an opaque base/layer paint and Formula P3 Green Ink 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). Green Ink is a little lighter, cooler than Feral Green. They are different kinds of paint.
The same difference applies the other way round: Feral Green is a little darker, warmer.
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 Feral Green on the colour wheel See Green Ink on the colour wheel
All matches: Feral Green equivalents · Green Ink equivalents