ΔE 20.6, loose: different enough that you should pick on purpose. Ghost Green is a little darker, much more saturated than Trooper White.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 21). Ghost Green is a little darker, much more saturated than Trooper White.
The same difference applies the other way round: Trooper 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 Trooper White on the colour wheel See Ghost Green on the colour wheel
All matches: Trooper White equivalents · Ghost Green equivalents