File size: 47.4/45.1 MB | Qtrac DiffPDF / diffpdfc 5.8.3
DiffPDF is a Windows graphical user interface (GUI) application for comparing two PDF files. DiffPDF shows pairs of pages from the two PDFs being compared with any differences highlighted. Comparisons can be made based on the text regardless of layout, or based on appearance (which accounts for fonts, colors, layout, diagrams, images, etc.)

DiffPDF is useful for anyone who needs to compare PDF documents, reports, books, or labels-for example, archivists, engineers, journalists, packagers, publishers, researchers, software testers, and translators. DiffPDF is used in a wide range of contexts, from book authors to banks, insurance companies, and Government.

diffpdfc - for comparing PDF files: a commercial console (command line) program for Windows.
diffpdfc can say whether two PDFs are the same or different, and it can optionally output one or more reports that show any differences. The reports can be textual in .csv (Excel), .json, and .xml format and visual in .png and .pdf format. Multiple reports can be output at the same time.
Comparisons can be made based on the text regardless of layout, or based on appearance (which accounts for fonts, colors, layout, diagrams, images, etc.)
diffpdfc is useful for anyone who needs to compare PDF documents, reports, books, or labels-for example, archivists, engineers, journalists, packagers, publishers, researchers, software testers, and translators. diffpdfc is used by many kinds of organization, including banks, insurance companies, and Government.

https://www.qtrac.eu/diffpdf-changes.html