Word Docx compatibility with Pages

Dear Community, I am concerned about an issue that I recently had with a colleague when trying to edit a paper. If a person sends a word docx document to me and they use Microsoft word and I use Apple pages, will the document be incompatible to the point that a number sequence within the document is changed? For example: if the document contains the number/statement sequence 1. xxx 2. xxx 3. xxx and I open the word docx on my MacBook pro set-up with pages can the sequence be changed to 7.3.1 sss 7.3.2 sss 7.3.4 sss so that the sender and I are unable to discuss editing 7.3.2 sss on my end because on their end it is 2. xxx ? Or does word docx and pages incompatibility manifest another other way? Thank you!