I'm not familiar with phone / watch products from the shiny fruit farm but I would have thought it would depend on the setting in the App which at a guess would be Spike?.
I use Android (green bin thing) with a Ticwatch that both use Wear OS this I use in conjunction with xDrip and there is a setting which forces the watch to connect to MiaoMiao and by pass the phone. When they are both close then they both pick up the same readings
Thinking about it, I'll tag
@Mel dCP because she uses shiny fruit farm stuff with a Pebble Watch and might be able to add something more useful than me. I'm sure there others just not sure who