ΔE 12.9, fair: the same colour family, but not a straight swap. Ivory RLM05 is much more saturated, cooler than Yellowed Bone.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Ivory RLM05 is much more saturated, cooler than Yellowed Bone.
The same difference applies the other way round: Yellowed Bone is much more muted, 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 Yellowed Bone on the colour wheel See Ivory RLM05 on the colour wheel
All matches: Yellowed Bone equivalents · Ivory RLM05 equivalents