Hi Lynnie!
Just curious on what big differences there are between the two compounds?
According to:
https://www.jw.org/en/jehovahs-witnesses/offices/united-states/
Patterson: Creates artwork for our publications as well as audio and video recordings. Tour highlights Bible schools that are taught here.
Wallkill: Prints over 25 million pieces of Bible literature annually. Ships literature in more than 360 languages to branches worldwide as well as to more than 15,000 congregations of Jehovah’s Witnesses in the United States, Canada, and the Caribbean.
Warwick : Three Self-Guided Exhibits: The Bible and the Divine Name; A People for Jehovah’s Name; and World Headquarters—Faith in Action. A 20-minute Guided tour highlights sections of the Offices/Services Building and the Warwick grounds.
Although it hasn't been updated, yet, the following tour brochure explains a bit more, including some of the history of Patterson and Walkill:
https://download-a.akamaihd.net/files/media_cmsassets/d5/fo_s-Us_E.pdf