During the duchess’s visit to the Coronation Street set, she stood behind the counter of its famous pub and remembered the late Queen Elizabeth II, who visited in 2021.
“We ought to drink a pint to my wonderful mother-in-law. She really loved her time here,” the duchess said.
Both the duchess and Ms Dyvenor are patrons of the Prevent Breast Cancer charity.
Ms Dyvenor, 61, was diagnosed with breast cancer in 2009 at the same time as her on-screen character.
The duchess received a breast cancer diagnosis last year and was later diagnosed with skin cancer.
She became a public advocate of the importance of getting checks for cancer and spoke openly about her own treatment.
On Wednesday, the duchess visited the Nightingale Centre in Wythenshawe, Manchester, supporting a drive to raise funds to train more breast imaging specialists.
She met staff and patients at the centre, which specialises in treating breast cancer.
“What I noticed today was I had a few private conversations with patients and they couldn’t get over that I was here having had a mastectomy, and that I said, ‘I’ve had a mastectomy. Here I am’,” she said.
“One of them in particular said, ‘Oh, so it wasn’t as frightening as you being led to believe?'”
The duchess spoke of her own fear after her diagnosis.
“You think it’s a death sentence. It’s not,” she said.
About her own progress, she said: “I’m doing very well, thank you. If I was talking Gen Z I’d say ‘slay’.”