Hi mrkris,
Unless you're using Word's 'Track Changes' tool, there would be no way for Word to identify which page(s) had been updated. Even then, it would be difficult for Word to know which changed pages should be printed. Suppose, for example, you add a paragraph. Should all the pages affected by the consequential pagination changes be printed? Since Word doesn't track that, user intervention would be required. Furthermore, how would it know which changes to print - all those made today, or only those since the last save? For the dangers of trying to maintain maulas on the basis of replacing individual pages, see:
http://word.mvps.org/FAQs/Numbering/ChapterNumber.htm