I hope they will communicate with each other. Unfortunately, there are many major UK banks not compatible with Samsung pay but compatible with Google pay. From a software developer perspective this is an indication to me that UK banks generally do not trust Samsung and are not working closely. These banking apps are mainly designed for Google's Android OS versions without taking into account that Android being an open source project is modifiable by other companies like Samsung or OnePlus to introduce their own version of Andoid like OneUI 5.0 by Samsung or Oxygen OS by OnePlus. Thats why the UK banking apps generally stay confused in these non plain Android OS from Samsung or OnePlus thinking it to be some malicious bloatware. I hope in future the UK banks are gonna welcome Samsung with their payment platforms as a more trusted and innovative company.