ΔE 10.8, fair: the same colour family, but not a straight swap. Middle Stone is a little darker, more muted, warmer than Bog Moss.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Middle Stone is a little darker, more muted, warmer than Bog Moss.
The same difference applies the other way round: Bog Moss is a little lighter, more saturated, 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 Bog Moss on the colour wheel See Middle Stone on the colour wheel
All matches: Bog Moss equivalents · Middle Stone equivalents