Suggestions by @colinsilber

Michael Rosenbaum

as Floyd Lawton in Batman

Score: 0

Matt Oberg

as Chuck Brown in Batman

Score: +1

Jerry Seinfeld

as Arthur Brown in Batman

Score: -1

Dylan Sprouse

as Tweedledum in Batman

Score: +2

Cole Sprouse

as Tweedledee in Batman

Score: +2

Alan Silvestri

as Composer in Till

Score: +1

Ava DuVernay

as Writer in Till

Score: +1

Spike Lee

as Producer in Till

Score: +2

Ryan Coogler

as Director in Till

Score: +2

Keith L. Williams

as Simeon Wright (young) in Till

Score: +1

James Earl Jones

as Simeon Wright in Till

Score: +1

Samuel L. Jackson

as Mose Wright in Till

Score: +1

Billy Unger

as Roy Bryant in Till

Score: +1

Victoria Vida

as Carolyn Bryant in Till

Score: +1

John David Washington

as Louis Till in Till

Score: +1

Raven-Symoné

as Mamie Till in Till

Score: +1

Caleb McLaughlin

as Emmett Till in Till

Score: -1