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