ΔE 43.2, loose: different enough that you should pick on purpose. Warm Yellow is a little lighter, warmer than Ghillie Dew.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 43). Warm Yellow is a little lighter, warmer than Ghillie Dew.
The same difference applies the other way round: Ghillie Dew is a little darker, 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 Ghillie Dew on the colour wheel See Warm Yellow on the colour wheel
All matches: Ghillie Dew equivalents · Warm Yellow equivalents