Pastel Seafoam vs Bag of Bones

How close are they?

ΔE 46.9, loose: different enough that you should pick on purpose. Bag of Bones is noticeably darker, much more saturated, warmer than Pastel Seafoam.

Can I use Bag of Bones instead of Pastel Seafoam?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 47). Bag of Bones is noticeably darker, much more saturated, warmer than Pastel Seafoam.

Can I use Pastel Seafoam instead of Bag of Bones?

The same difference applies the other way round: Pastel Seafoam is noticeably lighter, much more muted, 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.