Golding is a group of aroma-type cultivars originating in England. Over the decades, the group has been changed and widened. Mostly they have been named after villages in East Kent, (Petham, Rothersham, Canterbury, Eastwell) or hop farmers, who grew them (Amos's Early Bird, Cobbs).
English Goldings grown in East Kent, are a premium hop, called East Kent Golding and should not be confused with U.K. Goldings, which are grown in other parts such as Kent, Worcestershire, Hampshire and Herefordshire. The cultivar grown in the USA (Oregon and Washington State) is a Canterbury Golding.
The premier English aroma hop. Superb in English-style ales, and lend a unique character to fine lagers as well. This hop has a unique spicy aroma and refined flavor. (alpha acid: 4.0-6.0% / beta acid: 2.0-3.0%)
EKG and U.S. Goldings are different cultivars, but I don't know how much difference will be detectable in the final beer.
Good question. I have a pound of U.S. Goldings in my freezer and I'm planning on using them (and Willamette, which is related to Fuggles) for my english ales this year.