ΔE 15.3, loose: different enough that you should pick on purpose. Moss Green is noticeably darker, more muted than Death World Forest.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Moss Green is noticeably darker, more muted than Death World Forest.
The same difference applies the other way round: Death World Forest is noticeably lighter, more saturated.
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 Death World Forest on the colour wheel See Moss Green on the colour wheel
All matches: Death World Forest equivalents · Moss Green equivalents