Monster Brown vs Baneblade Brown

How close are they?

ΔE 15.1, loose: different enough that you should pick on purpose. Baneblade Brown is a little lighter, more saturated than Monster Brown.

Can I use Baneblade Brown instead of Monster Brown?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Baneblade Brown is a little lighter, more saturated than Monster Brown.

Can I use Monster Brown instead of Baneblade Brown?

The same difference applies the other way round: Monster Brown is a little darker, more muted.

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.