Again, it is not the change in screen resolution that will change a column width, unless you are talking about the displayed width rather than the printed width.

This does not appear to be the case from your screenshot.

I am trying to figure out the cause of the change.

Is the column width setting the same for every table?

Was there a change in version of Word between document generation and use? If so, what are the versions of Word involved?

Are the documents in .doc format or .docx format?

Final note: I do not recognize the language setting? Is that Portuguese?