ΔE 10.4, fair: the same colour family, but not a straight swap. Creamy Ivory is noticeably darker than Arid Earth.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Creamy Ivory is noticeably darker than Arid Earth.
The same difference applies the other way round: Arid Earth is noticeably lighter.
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 Arid Earth on the colour wheel See Creamy Ivory on the colour wheel
All matches: Arid Earth equivalents · Creamy Ivory equivalents