The UK and the US have a lot in common and aside from our accents, outsiders looking in would probably say that we are pretty much the same. Yet within our similarities there are many astounding differences which brings rise to the phenomenon of things which are different but the same.
In the US they call the item of outwear with two legs 'pants' while the British will call them 'trousers'. 'Pants' to the British means underwear. What Americans refer to as 'chips' the British call 'crisps' with 'chips' for the British being what American's call 'french fries'. Confused yet?
Taking the example of chips/crisps/french fries, the are the same in that they are all potato based products but remain significantly different. The average person is more likely to want a side of french fries with their steak rather than chips.