ΔE 17.5, loose: different enough that you should pick on purpose. Pale Green is a little lighter, much more muted than IJN Mitsubishi Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 18). Pale Green is a little lighter, much more muted than IJN Mitsubishi Green.
The same difference applies the other way round: IJN Mitsubishi Green is a little darker, much more saturated.
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 Pale Green on the colour wheel
All matches: IJN Mitsubishi Green equivalents · Pale Green equivalents