Transparent Brown vs Ink Black Green

How close are they?

ΔE 27.8, loose: different enough that you should pick on purpose. Ink Black Green is a little darker, more muted, cooler than Transparent Brown.

Can I use Ink Black Green instead of Transparent Brown?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 28). Ink Black Green is a little darker, more muted, cooler than Transparent Brown.

Can I use Transparent Brown instead of Ink Black Green?

The same difference applies the other way round: Transparent Brown is a little lighter, 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.