ΔE 12.7, fair: the same colour family, but not a straight swap. Medium Grey is a little lighter, more muted, cooler than Hobgrot Hide.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Medium Grey is a little lighter, more muted, cooler than Hobgrot Hide.
The same difference applies the other way round: Hobgrot Hide is a little darker, more saturated, warmer.
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 Hobgrot Hide on the colour wheel See Medium Grey on the colour wheel
All matches: Hobgrot Hide equivalents · Medium Grey equivalents