ΔE 12.5, fair: the same colour family, but not a straight swap. Undergrowth Green is a little lighter, more saturated than IJN Mitsubishi Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Undergrowth Green is a little lighter, more saturated than IJN Mitsubishi Green.
The same difference applies the other way round: IJN Mitsubishi Green is a little darker, more muted.
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 IJN Mitsubishi Green on the colour wheel See Undergrowth Green on the colour wheel
All matches: IJN Mitsubishi Green equivalents · Undergrowth Green equivalents