ΔE 12.7, fair: the same colour family, but not a straight swap. Light Red is noticeably lighter than Pyrrole Red Dark.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Light Red is noticeably lighter than Pyrrole Red Dark.
The same difference applies the other way round: Pyrrole Red Dark is noticeably darker.
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 Pyrrole Red Dark on the colour wheel See Light Red on the colour wheel
All matches: Pyrrole Red Dark equivalents · Light Red equivalents