ΔE 12.0, fair: the same colour family, but not a straight swap. Autumn Sage is a little lighter, more muted, cooler than Mecha Light Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Autumn Sage is a little lighter, more muted, cooler than Mecha Light Green.
The same difference applies the other way round: Mecha Light Green is a little darker, more saturated, 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 Mecha Light Green on the colour wheel See Autumn Sage on the colour wheel
All matches: Mecha Light Green equivalents · Autumn Sage equivalents