Different File Sizes. Huh?

So, before I forget: I'm using Acrobat Standard 9.3.3
I'm printing from Word 2007 into a PDF. The docx has 72 letter-sized pages w/ plenty of full-page jpegs and a variety of smaller graphics linked in (please: no "should have used InDesign" comments). The docx is approx 300 KB, all graphics together are approx. 80 MB. When printing the full doc, the resulting PDF is around 57 MB.
I have a 2nd very similar document w/ 59 pages that's also around 300 KB. The graphics for this one amount to approx. 70 MB. However, the resulting PDF is only about 12 MB--yet it looks just fine. Both print jobs have the exact same settings.
Trying to reduce the file size of the 57 MB file, I started messing around w/ the larger doc. I printed the first 10 pages which only have 2 full-page jpegs. The result is approx. 1.3 MB. I then printed only one of the full-page graphic pages out of Word and the outcome was a 3.9 MB (!!!!) PDF. How can a PDF with a single page be more than double the size of a PDF with 10 pages when one of those pages is exactely the same????
Either I don't understand or something's screwy here. I don't get it. Help would really be appreciated.
Here are my 2 test PDFs:
http://zinfandelplymouth.com/zn1.pdf (1.3 MB--10 pages)
http://zinfandelplymouth.com/zn2.pdf (3.9 MB--1 page)

Thanks.
Where are you able to see the sizes of the embedded graphics?
Those 2 PDFs were created from the exact same docx by using the "Adobe PDF" print driver. One time I tell Word to print pages "1-10", the other time I just print page 10. Yet, the file size of the single-page PDF is much bigger than the file size of the 10-page PDF. Same document, same printer driver w/ same settings. Does not seem to make sense.

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