I don't remember the model n's, but my understanding is the small machine is the same as the 8780 and the big machine is 11 inches wider (sieves) with more hp and a bigger bin.
It's all right here, click on attachments on the left under the heading Topics, then click on the Massey heading that will take you to the agco homepage. Click on North America, then on the next page click on Massey(right side of page),click on product information, click on 9000 combine, click on spec. You should have most of the information you need. Good luck
Thanks northernfarmer, but I don't get a "spec" tab to click on thereIJ My info on a 8780XP says it weighs 24750lbs so all I need is what a 9690 weighs if anyone knowsIJ Thanks, JD