ΔE 15.2, loose: different enough that you should pick on purpose. Straken Green is more saturated, warmer than IJA Nakajima Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Straken Green is more saturated, warmer than IJA Nakajima Green.
The same difference applies the other way round: IJA Nakajima Green is more muted, 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 IJA Nakajima Green on the colour wheel See Straken Green on the colour wheel
All matches: IJA Nakajima Green equivalents · Straken Green equivalents