Baneblade Brown vs Viridian Green

How close are they?

ΔE 25.6, loose: different enough that you should pick on purpose. Viridian Green is a little darker, more muted, cooler than Baneblade Brown.

Can I use Viridian Green instead of Baneblade Brown?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Viridian Green is a little darker, more muted, cooler than Baneblade Brown.

Can I use Baneblade Brown instead of Viridian Green?

The same difference applies the other way round: Baneblade 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.