ΔE 25.5, loose: different enough that you should pick on purpose. Troll Snot Green is noticeably lighter, much more muted, warmer than Mortarion Green Clear.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 26). Troll Snot Green is noticeably lighter, much more muted, warmer than Mortarion Green Clear.
The same difference applies the other way round: Mortarion Green Clear is noticeably darker, 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 Mortarion Green Clear on the colour wheel See Troll Snot Green on the colour wheel
All matches: Mortarion Green Clear equivalents · Troll Snot Green equivalents