ΔE 27.4, loose: different enough that you should pick on purpose. Mantis Warriors Green is noticeably darker, much more muted, cooler than Ghillie Dew.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 27). Mantis Warriors Green is noticeably darker, much more muted, cooler than Ghillie Dew.
The same difference applies the other way round: Ghillie Dew is noticeably lighter, much more saturated, warmer.
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 Ghillie Dew on the colour wheel See Mantis Warriors Green on the colour wheel
All matches: Ghillie Dew equivalents · Mantis Warriors Green equivalents