You'll note that every source that references CESA White Papers in that Wikipedia page is the very same one, pointing to the 2021 book. I don't know if there were updates or if the books include the entire back catalogue of data from prior consoles with each release, but I wouldn't be surprised if it were just a case of misguided source correction.
Taking a dig, I see edits in the page history of at least one user adding a single ISBN to all of the CESA 'sourced' titles. On the 25th of April, 2017, a user changed the page's list layout to stop including sales by region, instead opting to source the total sales more comprehensively with a reference inclusive of the 2004 CESA White Paper alongside the organization's article, year, ISBN, and page numbers. At this point, all of the sales data in the OP for GBA title sales were precisely the same so far as I've seen.
The very next day on the 26th of April 2017, another user made three edits: the first moving the page to a newly titled one, and the next plainly removing all information in that specific reference outside of the words CESA White Paper and the link to the parent organization's article. It was on the 6th of December 2019 -over two years later- that someone noted that there was no ISBN and tagged the defaced sources accordingly. On the 15th of July, 2022, a less detailed update was made adding the ISBN for the 2021 CESA White Book without any particular detail. Indeed, it was just the latest book published at the time.
You can imagine that this means you might not find anything of worth because of this lack of specificity.
For the matter of Donkey Kong Country 2, it was only actually added to the Wikipedia page on the 12th of November 2020 and just linked to the same vague White Paper reference as many of the other entries. I can't speak for the Japanese page or the possibility of regional cross-referencing, which is one of the other pitfalls of the site.