Hi Scherge,
Thanks for your inquiry. Please note that Aspose.Words tries to mimic the same behavior as MS Word do. If you insert Mac document to Windows document and vice versa by using MS Word, you will get the same output (page-break between two documents)
In your case, I suggest you please use the insertDocument method to insert a Document at any location of another document. Please read the detail from here:
https://docs.aspose.com/words/java/insert-and-append-documents/
private void combineDocuments(Document srcDoc, Document targetDoc, String name) throws Exception
{
// srcDoc.getFirstSection().getPageSetup().setSectionStart(SectionStart.CONTINUOUS);
// targetDoc.appendDocument(srcDoc, ImportFormatMode.USE_DESTINATION_STYLES);
insertDocument(targetDoc.getLastSection().getBody().getLastParagraph(), srcDoc);
System.out.println("Page count " + name + ": " + targetDoc.getPageCount());
targetDoc.save(MyDir + name + ".pdf", SaveFormat.PDF);
}