ΔE 14.9, fair: the same colour family, but not a straight swap. Bog Moss is more saturated, warmer than Witch Brew.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 15). Bog Moss is more saturated, warmer than Witch Brew.
The same difference applies the other way round: Witch Brew is 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.
See Witch Brew on the colour wheel See Bog Moss on the colour wheel
All matches: Witch Brew equivalents · Bog Moss equivalents