ΔE 14.5, fair: the same colour family, but not a straight swap. Vulkan Green is noticeably darker, warmer than Forest of Shadows.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 14). Vulkan Green is noticeably darker, warmer than Forest of Shadows.
The same difference applies the other way round: Forest of Shadows is noticeably lighter, 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 Forest of Shadows on the colour wheel See Vulkan Green on the colour wheel
All matches: Forest of Shadows equivalents · Vulkan Green equivalents