Trooper White vs Bone White

How close are they?

ΔE 16.3, loose: different enough that you should pick on purpose. Bone White is noticeably darker, more saturated than Trooper White.

Can I use Bone White instead of Trooper White?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 16). Bone White is noticeably darker, more saturated than Trooper White.

Can I use Trooper White instead of Bone 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.