IJA #27 Ao Midori iro (Blue- Green) vs Lupercal Green

How close are they?

ΔE 8.9, close: similar, with a visible difference side by side. Lupercal Green is a little lighter, warmer than IJA #27 Ao Midori iro (Blue- Green).

Can I use Lupercal Green instead of IJA #27 Ao Midori iro (Blue- Green)?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Lupercal Green is a little lighter, warmer than IJA #27 Ao Midori iro (Blue- Green).

Can I use IJA #27 Ao Midori iro (Blue- Green) instead of Lupercal Green?

The same difference applies the other way round: IJA #27 Ao Midori iro (Blue- Green) is a little darker, 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.