ΔE 13.1, fair: the same colour family, but not a straight swap. Feral Green is noticeably lighter, cooler than IJN Mitsubishi Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Feral Green is noticeably lighter, cooler than IJN Mitsubishi Green.
The same difference applies the other way round: IJN Mitsubishi Green is noticeably darker, 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 IJN Mitsubishi Green on the colour wheel See Feral Green on the colour wheel
All matches: IJN Mitsubishi Green equivalents · Feral Green equivalents