ΔE 8.9, close: similar, with a visible difference side by side. Splinter Green is a little lighter, more muted, warmer than Vulkan Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Splinter Green is a little lighter, more muted, warmer than Vulkan Green.
The same difference applies the other way round: Vulkan Green is a little darker, more saturated, 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 Splinter Green on the colour wheel
All matches: Vulkan Green equivalents · Splinter Green equivalents