ΔE 10.5, fair: the same colour family, but not a straight swap. Black Green is more muted than IJA #27 Ao Midori iro (Blue- Green).
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Black Green is more muted than IJA #27 Ao Midori iro (Blue- Green).
The same difference applies the other way round: IJA #27 Ao Midori iro (Blue- Green) is 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 IJA #27 Ao Midori iro (Blue- Green) on the colour wheel See Black Green on the colour wheel
All matches: IJA #27 Ao Midori iro (Blue- Green) equivalents · Black Green equivalents