ΔE 15.1, loose: different enough that you should pick on purpose. Metallic Brown is more saturated than Screaming Bell.
Can I use Metallic Brown instead of Screaming Bell?
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 15). Metallic Brown is more saturated than Screaming Bell.
Can I use Screaming Bell instead of Metallic Brown?
The same difference applies the other way round: Screaming Bell is 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.