British English: "A source for that? I would be surprised it was actually 99%." American English: "A source for that? I would be surprised it was actually 99%.

British English: "A source for that? I would be surprised it was actually 99%." American English: "A source for that? I would be surprised it was actually 99%." Maybe if you count spelling, it might be less, but it's not like 'colour' and 'color' are different words in functional terms.