ΔE 10.3, fair: the same colour family, but not a straight swap. Dark Umber is a little darker, warmer than Rhinox Hide.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Dark Umber is a little darker, warmer than Rhinox Hide.
The same difference applies the other way round: Rhinox Hide is a little lighter, 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 Rhinox Hide on the colour wheel See Dark Umber on the colour wheel
All matches: Rhinox Hide equivalents · Dark Umber equivalents