ΔE 9.3, close: similar, with a visible difference side by side. Sons of Horus Green is a little darker, more saturated than Medieval Forest.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Sons of Horus Green is a little darker, more saturated than Medieval Forest.
The same difference applies the other way round: Medieval Forest is a little lighter, more muted.
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 Medieval Forest on the colour wheel See Sons of Horus Green on the colour wheel
All matches: Medieval Forest equivalents · Sons of Horus Green equivalents