ΔE 15.6, loose: different enough that you should pick on purpose. Mage Hunter Green is a little lighter, much more saturated than Eshin Grey.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Mage Hunter Green is a little lighter, much more saturated than Eshin Grey.
The same difference applies the other way round: Eshin Grey is a little darker, much 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 Eshin Grey on the colour wheel See Mage Hunter Green on the colour wheel
All matches: Eshin Grey equivalents · Mage Hunter Green equivalents