ΔE 14.4, fair: the same colour family, but not a straight swap. Chromium Oxide Green Dark is a little lighter, more saturated, cooler than Webbing Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Chromium Oxide Green Dark is a little lighter, more saturated, cooler than Webbing Green.
The same difference applies the other way round: Webbing Green is a little darker, more muted, 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 Webbing Green on the colour wheel See Chromium Oxide Green Dark on the colour wheel
All matches: Webbing Green equivalents · Chromium Oxide Green Dark equivalents