Is this a domestic duck (maybe khaki campbell) or a younger female wild duck?

Hi all!

Saw this duck today, wild in South Yorkshire.  Doesn't quite look like a female of the species I'm used to, so wondered if it was a domestic breed instead. The Khaki Campbell seems to be all brown, but I know nothing about domestic ducks.  Please do let me know if it's some normal duck I should know otherwise!

Thanks so much!