ΔE 11.1, fair: the same colour family, but not a straight swap. Feral Green is a little darker, cooler than Matt Lime Green. They are different kinds of paint: AMMO by Mig Matt Lime Green is an ink, glaze or transparent paint and Army Painter Feral Green is an opaque base/layer paint, so they won’t behave the same on the model even where the colour is close.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Feral Green is a little darker, cooler than Matt Lime Green. They are different kinds of paint.
The same difference applies the other way round: Matt Lime Green is a little lighter, 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 Matt Lime Green on the colour wheel See Feral Green on the colour wheel
All matches: Matt Lime Green equivalents · Feral Green equivalents