Acrobat DC "compare files" function cannot be compared correctly
I have two PDF files, and the difference between them is in the text below the barcode. However, when I use acrobat pro dc "compare files" to compare these two files, the software does not find any difference. Different parts of these two PDF files can be easily found by the naked eye. Why can't acrobat automatically compare them? What do you think of the experts? What is the principle of acrobat compare files? Are there any restrictions?
My operation: open these two different PDFs using Acrobat Pro DC -- open the "compare files" function -- compare by default
Computer system: MacOS 10.14.6
Software version: Pro DC 2020.006.20034
