In as much as they change more than minor spelling or punctuation mistakes, absolutely yes. For example, https://en.wikipedia.org/wiki/Expurgation and https://en.wikipedia.org/wiki/Censorship_in_the_Soviet_Union...
> Is someone taking all the old copies from the used book store and destroying them?
"We haven't yet falsified everything, and there are still non-falsified copies remaining, so why worry?" - original versions in some dusty corner of an old book store are no good if the great majority of people is only exposed to fakes, and one in ten people who read those fakes eventually, possibly years later, learns their version was altered in unspecified ways.