ΔE 11.4, fair: the same colour family, but not a straight swap. Deep Green is warmer than Mecha Dark Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Deep Green is warmer than Mecha Dark Green.
The same difference applies the other way round: Mecha Dark Green is cooler.
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 Dark Green on the colour wheel See Deep Green on the colour wheel
All matches: Mecha Dark Green equivalents · Deep Green equivalents