ΔE 17.5, loose: different enough that you should pick on purpose. Mage Hunter Green is much more muted, warmer than Guardian Green.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). Mage Hunter Green is much more muted, warmer than Guardian Green.
The same difference applies the other way round: Guardian Green is much 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 Guardian Green on the colour wheel See Mage Hunter Green on the colour wheel
All matches: Guardian Green equivalents · Mage Hunter Green equivalents