ΔE 9.6, close: similar, with a visible difference side by side. Med. Flesh Tone is a little lighter than Golfag Brown.
Can I use Med. Flesh Tone instead of Golfag Brown?
Usually, if you are not matching paint already on the model. Close match (ΔE 10). Med. Flesh Tone is a little lighter than Golfag Brown.
Can I use Golfag Brown instead of Med. Flesh Tone?
The same difference applies the other way round: Golfag Brown is a little darker.
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.