ΔE 13.7, fair: the same colour family, but not a straight swap. Forest Sprite is a little lighter, more saturated, cooler than Matt Military Green. They are different kinds of paint: AMMO by Mig Matt Military Green is an ink, glaze or transparent paint and Army Painter Forest Sprite 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 14). Forest Sprite is a little lighter, more saturated, cooler than Matt Military Green. They are different kinds of paint.
The same difference applies the other way round: Matt Military Green is a little darker, more muted, 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 Military Green on the colour wheel See Forest Sprite on the colour wheel
All matches: Matt Military Green equivalents · Forest Sprite equivalents