ΔE 15.2, loose: different enough that you should pick on purpose. Dark Reaper is a little lighter, more muted, cooler than IJA #27 Ao Midori iro (Blue- Green).
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Dark Reaper is a little lighter, more muted, cooler than IJA #27 Ao Midori iro (Blue- Green).
The same difference applies the other way round: IJA #27 Ao Midori iro (Blue- Green) is a little darker, more saturated, 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 IJA #27 Ao Midori iro (Blue- Green) on the colour wheel See Dark Reaper on the colour wheel
All matches: IJA #27 Ao Midori iro (Blue- Green) equivalents · Dark Reaper equivalents