ΔE 20.0, loose: different enough that you should pick on purpose. Flanker Light Blue is noticeably darker, more saturated than Trooper White.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Flanker Light Blue is noticeably darker, more saturated than Trooper White.
The same difference applies the other way round: Trooper White is noticeably lighter, 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 Flanker Light Blue on the colour wheel
All matches: Trooper White equivalents · Flanker Light Blue equivalents