Barnes sets out some parallel passages. I haven’t read either book, so I can’t express an opinion on whether there’s plagiarism, sloppiness, or absolutely nothing at all wrong here. But that’s my point.
Alexander Lindey, author of what is still, after fifty years, the most influential work on plagiarism, warned that “We must be careful. . . not to confuse borrowing with theft.” He also warned against the use of parallels to prove plagiarism.
Employed with probity and intelligence, parallels can be of help – limited help. . . . But the narrow nature of their function must never be lost sight of. They must not be allowed to becloud or eclipse the paramount canon that the crucial test of plagiarism is and must be a reading of the rival works themselves in their entirety.(The Modern Language Association takes a somewhat stricter approach, but their justification for doing so is dubious, at least outside the realm of student copying). Nonetheless, if similar scandals are any guide, we can be certain that the press will not do that. They will either ignore the matter entirely (because it would be too much work to do otherwise) or they will treat it with a broad brush. This is all the more bizarre given the tendency of the press to recycle press releases, and one another’s stories, without attribution all the time.
If you're interested in this topic in more detail, my 1997 book (coauthored with the estimable Peter W. Morgan), The Appearance of Impropriety: How the Ethics Wars Have Undermined American Government, Business and Society has an entire chapter dedicated to plagiarism and the way it is addressed -- or misaddressed -- by the media and pundits.