ΔE 12.6, fair: the same colour family, but not a straight swap. Hobgrot Hide is warmer than RAL 7009 Hellgrau.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Hobgrot Hide is warmer than RAL 7009 Hellgrau.
The same difference applies the other way round: RAL 7009 Hellgrau is 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 RAL 7009 Hellgrau on the colour wheel See Hobgrot Hide on the colour wheel
All matches: RAL 7009 Hellgrau equivalents · Hobgrot Hide equivalents