ΔE 14.3, fair: the same colour family, but not a straight swap. Red RLM23 is a little darker, cooler than Red Orange.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Red RLM23 is a little darker, cooler than Red Orange.
The same difference applies the other way round: Red Orange is a little lighter, 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 Red Orange on the colour wheel See Red RLM23 on the colour wheel
All matches: Red Orange equivalents · Red RLM23 equivalents