ΔE 10.7, fair: the same colour family, but not a straight swap. Red RLM23 is cooler than Quinacridone Red Light.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 11). Red RLM23 is cooler than Quinacridone Red Light.
The same difference applies the other way round: Quinacridone Red Light is 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 Quinacridone Red Light on the colour wheel See Red RLM23 on the colour wheel
All matches: Quinacridone Red Light equivalents · Red RLM23 equivalents