ΔE 6.1, close: similar, with a visible difference side by side. Red RLM23 is a little darker than Toluidine Red.
Usually, if you are not matching paint already on the model. Close match (ΔE 6). Red RLM23 is a little darker than Toluidine Red.
The same difference applies the other way round: Toluidine Red is a little lighter.
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 Toluidine Red on the colour wheel See Red RLM23 on the colour wheel
All matches: Toluidine Red equivalents · Red RLM23 equivalents