Roache will play the Corrie veteran in BBC Four's The Road to Coronation Street. He is also currently appearing in the ITV soap as Ken Barlow's grandson, alongside his half-brother Linus.
"I watched old clips of daddy," he told The Sun. "It will be very strange watching it with him."
He added: "He was very dashing. It's the Roache genes."
The 24-year-old praised the one-off drama's cast, which includes Jessie Wallace, Lynda Baron and Celia Imrie.
"The cast is amazing," he said. "It was such a privilege."
The Road to Coronation Street airs tonight at 9pm on BBC Four.
> Bill Roache 'emotional after Corrie drama'