ΔE 17.7, loose: different enough that you should pick on purpose. Poxwalker is noticeably darker, much more muted than Light Green. They are different kinds of paint: AMMO by Mig Light Green is an ink, glaze or transparent paint and Citadel Poxwalker is a wash/shade, so they won’t behave the same on the model even where the colour is close.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Poxwalker is noticeably darker, much more muted than Light Green. They are different kinds of paint.
The same difference applies the other way round: Light Green is noticeably lighter, much more saturated.
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 Light Green on the colour wheel See Poxwalker on the colour wheel
All matches: Light Green equivalents · Poxwalker equivalents