ΔE 16.1, loose: different enough that you should pick on purpose. Straken Green is cooler than IJN M3 (M) Mitsubishi Interior Green.
Can I use Straken Green instead of IJN M3 (M) Mitsubishi Interior Green?
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Straken Green is cooler than IJN M3 (M) Mitsubishi Interior Green.
Can I use IJN M3 (M) Mitsubishi Interior Green instead of Straken Green?
The same difference applies the other way round: IJN M3 (M) Mitsubishi Interior Green is 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.