This is true, but an ISO UK keyboard also "provides four easily accessible pairs of single-character symmetrical 'brackets'"; for this particular purpose there is no distinguishing factor between the two layouts.

There are other layouts in North America, including French (Canada), Bilingual (also common in Canada), Spanish (Mexico). Plus a multitude of people who have other preferred layouts. There is no official layout for this landmass.

They are identical when it comes to brackets.