Using @Persisted var in one of six realm files instead of @objc private var in Project

I have an iOS project with 6 Realm classes defined. They all use the @obj dynamic var … syntax in the class definitions for properties. I am wanting to try the newer Realm syntax using @Persisted var … on the properties and ObjectKeyIdentifiable in the Class definition. If I do that for one class, do I have to convert all the classes to do the same. I will do it over time if possible but hope I can work with the older class definitions for a while I test this process.