pdf file has differences when i open it in illustrator

Question

Hello everyone! Ι have a pdf file, i want to make some changes and I open it in illustrator.

I don't get the message "This document has been modified outside of Adobe Illustrator", but in illustrator it's not exactly the same file, it has differences. The differences are not necessary that big so that i can trace them easily, i have to cross check. For example there are different numbers in some places or a box have been moved in another place.

The file has been created from Adobe Illustrator CC 23.1 (Windows), i use Adobe Illustrator 28.5 (Macintosh).
Do you know why this may happen and how i could avoid from making changes in a wrong files?

Monika Gause · Answer

Has the file been created in Illustrator?

The message says that the PDF part of the file is different than the AI part. Did you change it in Acrobat or another app?

Here's how Illustrator saves files: https://youtu.be/IpDh8Y7q8yE

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