ΔE 12.2, fair: the same colour family, but not a straight swap. Light Green RLM25 is a little darker, more saturated, warmer than Dark Green-Grey.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Light Green RLM25 is a little darker, more saturated, warmer than Dark Green-Grey.
The same difference applies the other way round: Dark Green-Grey is a little lighter, more muted, cooler.
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 Dark Green-Grey on the colour wheel See Light Green RLM25 on the colour wheel
All matches: Dark Green-Grey equivalents · Light Green RLM25 equivalents