Yes that is correct. Snap-On it seems has gone to more buying parts as Complete Assy. My take on that is the updated version or revisions. Snap-On is famous for revising their tools. Its a good thing in a way. You have to just make sure you are spending more on updating your tool than the cost...
As stated alot of tools from Mac, Matco Cornwell ect are made by Ingersoll Rand. I have been rebuilding air tools for over 25 years. However these tool truck air tools changes alot because of whom on the outside is willing to build the tool in question with tool truck name on it for the best...