Comparing these two:
The source diff shows 4 rough areas that were changed, with the last modified paragraph being:
- Nelson co-founded "itty bitty machine company", or "ibm", which was a small computer retail store operating from 1977 to 1980 + In 1976, Nelson co-founded and briefly served as the advertising director of the "itty bitty machine company",
The visual diff continues to show more differences, except they are not differences. The graphs were not in any way touched by the edits in between.
I do notice that the reference numbers have effectively changed due additions higher up in the document. However, those are usually shown in grey/blue with a note about them in the side bar. And in fact, in the left image, there is an example of that.