Bubonic Ochre vs Balor Brown

How close are they?

ΔE 18.7, loose: different enough that you should pick on purpose. Balor Brown is a little darker, much more muted than Bubonic Ochre.

Can I use Balor Brown instead of Bubonic Ochre?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Balor Brown is a little darker, much more muted than Bubonic Ochre.

Can I use Bubonic Ochre instead of Balor Brown?

The same difference applies the other way round: Bubonic Ochre is a little lighter, much 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.