The Disney Channel and Co has made quite a few teen movies. One series of movies was the High School Musical and another was the ones about Hannah Montana. Some of the girls were made with the same sculpt, a new one for these characters that may or may not be a modified Carnaval. HSM Gabriella and Miley/Hannah share face. The Camp Rock Mitchie doll is another character with this sculpt.
Kelsi and Tiana had other head sculpts, perhaps they shared face but I have none of them to actually verify.

Disney Teen
©2007
Mattel INC.

Miley/Hannah

Miley Cyrus played the young Miley Stewart and her alter ego Hannah Montana, that named the series.


Hannah Montana
bought loose - was originally sold in gift set with Miley below

Miley Stewart,
bought loose - was originally sold in gift set with Hannah above

Gabriella

High School Musical Gabriella was also seen using this face.

#M2968 High School Musical - Summer Romance Gabriella, 2007
(sold in a 2-doll set with Troy)
Photographed through box plastic

Mitchie

Mitchie from the Camp Rock series was made with this face. Demi Lovato did the role of Mitchie. There is some resemblance, but the doll is not a spitting image of the adorably cute Miss Lovato. 

# Camp Rock Mitchie,
(sold in a 2-doll set with Shane)
Bought loose