ΔE 13.3, fair: the same colour family, but not a straight swap. Maggot Skin is a little lighter, more muted than Matt Light Olive Drab. They are different kinds of paint: AMMO by Mig Matt Light Olive Drab is an ink, glaze or transparent paint and Army Painter Maggot Skin is a one-coat contrast-style 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 13). Maggot Skin is a little lighter, more muted than Matt Light Olive Drab. They are different kinds of paint.
The same difference applies the other way round: Matt Light Olive Drab is a little darker, 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 Matt Light Olive Drab on the colour wheel See Maggot Skin on the colour wheel
All matches: Matt Light Olive Drab equivalents · Maggot Skin equivalents