ΔE 11.8, fair: the same colour family, but not a straight swap. IDF Gray 3 Modern is more muted, cooler than Mocca Skin.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). IDF Gray 3 Modern is more muted, cooler than Mocca Skin.
The same difference applies the other way round: Mocca Skin is 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 Mocca Skin on the colour wheel See IDF Gray 3 Modern on the colour wheel
All matches: Mocca Skin equivalents · IDF Gray 3 Modern equivalents