ΔE 13.6, fair: the same colour family, but not a straight swap. Light Green RLM25 is noticeably lighter, cooler than Emerald Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Light Green RLM25 is noticeably lighter, cooler than Emerald Green.
The same difference applies the other way round: Emerald Green is noticeably 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 Emerald Green on the colour wheel See Light Green RLM25 on the colour wheel
All matches: Emerald Green equivalents · Light Green RLM25 equivalents