Nurgling Green vs Bog Moss

How close are they?

ΔE 21.4, loose: different enough that you should pick on purpose. Bog Moss is a little darker, more saturated, warmer than Nurgling Green.

Can I use Bog Moss instead of Nurgling Green?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Bog Moss is a little darker, more saturated, warmer than Nurgling Green.

Can I use Nurgling Green instead of Bog Moss?

The same difference applies the other way round: Nurgling Green is a little lighter, more muted, 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.