All my 3 MacBooks, 1 Mac mini, iPad and iPhone all show the same tabs (24) at once, in order on the Tab bar.
they are in the same iCloud account and Wifi.
they are in High Sierra, Mojave, Catalina, Monterey, Ventura and iOS 16.Latest.
I have not checked my watch tho....
the advice would be give this iCloud set up a chance, I had problems several years ago when some did mot show up.