Can Realm Web use a service created from the "Real-time Sync" template?

If I create a service with the “Real-time Sync” template, there is no option to download React frontend code like in the “React.js + Realm Web Boilterplate”.

Do I need 2 services if I want to use React Native and React.js, or can Realm Web connect to a service with Device Sync even if it’s not supported?

My concern is that I would have to define the rules for “Data access” twice.