Suggestions by @fthargreeves

Reeve Carney

as Scotty Moore in The King

Score: +2

Lacey Chabert

as Rebecca Irene Burns in The King

Score: 0

Timothy Olyphant

as Sam Phillips in The King

Score: 0

Miles Teller

as Elvis Presley in The King

Score: +14

Dakota Johnson

as Stevie Nicks in Rockstars Biopics

Score: -6

Benedict Cumberbatch

as David Bowie in Rockstars Biopics

Score: -1

Evan Peters

as Kurt Cobain in Rockstars Biopics

Score: +27

Cody Fern

as Kurt Cobain in Rockstars Biopics

Score: -2

Lily-Rose Depp

as Caitlin Cooke in 6teen

Score: 0

Jaden Smith

as Wyatt Williams in 6teen

Score: +1

Sara Waisglass

as Jen Masterson in 6teen

Score: -2

Kelsey Asbille

as Nikki Wong in 6teen

Score: -1

Ricardo Hoyos

as Jonesy Garcia in 6teen

Score: -2

Dylan Sprouse

as Jude Lizowski in 6teen

Score: -2

Eva Noblezada

as Sally Bowles in Cabaret

Score: +3

Julia Goldani Telles

as Samantha Peralta in Brooklyn Nine-Nine

Score: +3

Rachael Soglin

as Sally Bowles in Cabaret

Score: +2