The differences come in what each company may or may not add to the yogurt. Our Greek yogurt here in the states contains no added sugar, so it only contains about 9 grams of sugar per serving. Just look at the ingredients in the ones you have in the UK and compare. The sugar in the unsweetened yogurt is naturally occurring, and does not interfere with the Candida treatment. The ingredients on ours reads:
“Grade A pasteurized skimmed milk, live active yogurt culture.”
It may or may not list the names of the bacteria in the yogurt.
Greek yogurt is creamier than regular natural yogurt and normally stronger as far as taste and the number of bacteria.