ΔE 9.7, close: similar, with a visible difference side by side. Sons of Horus Green is a little lighter, cooler than Guardian Green.
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Sons of Horus Green is a little lighter, cooler than Guardian Green.
The same difference applies the other way round: Guardian Green is a little darker, 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 Guardian Green on the colour wheel See Sons of Horus Green on the colour wheel
All matches: Guardian Green equivalents · Sons of Horus Green equivalents