Question: is it the same cast in mama mia 2

Answer: Yes, On June 1, 2017, it was announced that Seyfried would return as Sophie. Later that month, Dominic Cooper confirmed that he would return for the sequel, along with Streep, Firth and Brosnan as Sky, Donna, Harry, and Sam, respectively. In July 2017, Baranski was also confirmed to return as Tanya. On July 12, 2017, Lily James was cast to play the role of young Donna. On August 3, 2017, Jeremy Irvine and Alexa Davies were also cast in the film, with Irvine playing Brosnan's character Sam in a past era, and Hugh Skinner to play Young Harry, Davies as a young Rosie, played by Julie Walters. On August 16, 2017, it was announced that Jessica Keenan Wynn had been cast as a young Tanya, who is played by Baranski. Julie Walters and Stellan Skarsgård also reprised their roles as Rosie and Bill, respectively. On October 16, 2017, it was announced that singer and actress Cher had joined the cast, in her first on-screen film role since 2010, and her first film with Streep since Silkwood. The part was written specifically for Cher, and she got to choose Andy Garcia as her romantic partner.