B. Bruce Brinson wrote:
I understood from communications when Ventura was first released that file formats would be modified for some apps, etc, and thus both machines would need to be running Ventura. If that is true, then in fact if I wished to continue to have all devices reflect the same information then both machines would need to upgrade to Ventura.
I think there's a misunderstanding here. The files will be reflected on both devices over iCloud just fine. Also opening the files on Monterey that have been created or edited in Ventura should pose no issue, as both versions support the most current version of Apple's apps, such as Pages, Numbers and Keynote.
As neither the MacBook Air nor the MacMini are listed as compatible with Ventura it would seem to require, if I chose to move to Ventura, I would need to do so for both computers, and therefore both machines would also need to be updated to those compatible with Ventura.
No. Again, moving to Ventura on one device does not require you update everything.
It may be on a case by case basis what files may or may not open in what specific apps, but going from Monterey to Ventura should not cause any issues with opening most if not all file types.
I have a MacBook Air running Ventura, and a Mac Mini running High Sierra and I can still open pages documents made on the MacBook Air, on the Mac mini without any major issue.