The XRay stuff is normally pulled from Shelfari (and Wikipedia), and gets updated periodically (you get a 'snapshot' when the book is downloaded, and would need to re-download to get updates). I think I've even seen information (from Amazon to KDP users?) on how to create XRay data for a book by going to Shelfari and adding it there.
But UK editions may not link up to the same data as the US version (different ISBNs etc.). Or there may be some region specific legal restrictions on using it.
I'm just upset that I can't get the UK English editions of Harry Potter here in the USA (I want to know what JKR
really wrote). So these regional issues go both ways!