ΔE 20.4, loose: different enough that you should pick on purpose. Ghost Green is a little darker, much more saturated than Wrack White.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Ghost Green is a little darker, much more saturated than Wrack White.
The same difference applies the other way round: Wrack White is a little lighter, much more muted.
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 Wrack White on the colour wheel See Ghost Green on the colour wheel
All matches: Wrack White equivalents · Ghost Green equivalents