ΔE 12.8, fair: the same colour family, but not a straight swap. Warm Grey is a little lighter, cooler than Ishtar Pink.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Warm Grey is a little lighter, cooler than Ishtar Pink.
The same difference applies the other way round: Ishtar Pink is a little darker, 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 Ishtar Pink on the colour wheel See Warm Grey on the colour wheel
All matches: Ishtar Pink equivalents · Warm Grey equivalents