Sue, I'd be amazed if it wasn't the same people. But try following it back from known facts.
You have good details of their grand-daughter, obviously. Who were her parents? Does one of them fit these census details:
On the 1911 census you have:
James Greenwood, 48, born Lincoln. Occupation "Caretaker, church substitute"
Emma Greenwood, 52, born Deal, Kent. Married 20 years, 5 children, all living
James Greenwood, 17, born Leeds
Emma Greenwood, 14, born Loughborough
Dolly Greenwood, 11, born Loughborough
On the 1901 you have:
Emma Greenwood 44, born Deal, Kent
Lily Greenwood 8, born Leeds
James Greenwood 6, born Leeds
Leonard Greenwood 5, born Loughborough
Victoria Greenwood 4, born Loughborough
Dorothy Greenwood 1, born Loughborough
I would guess that "Dolly" and "Dorothy" are the same person, and I see a birth registration in 1897, Loughborough, for "Victoria Emma GREENWOOD, so thats the same person as well.
Already you have two different birth dates here for Emma - 1857 and 1859. It just seems likely that she was a bit 'vague' about her age. I know a lot of women like that :-)))
Its actually a VERY common problem with census records.
Nigel