ΔE 11.9, fair: the same colour family, but not a straight swap. Chromium Oxide Green Dark is a little lighter, warmer than Vulkan Green.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 12). Chromium Oxide Green Dark is a little lighter, warmer than Vulkan Green.
The same difference applies the other way round: Vulkan Green is a little darker, 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 Vulkan Green on the colour wheel See Chromium Oxide Green Dark on the colour wheel
All matches: Vulkan Green equivalents · Chromium Oxide Green Dark equivalents