Renaming of OSGi service having only private properties (no metatype)

[Konrad Windszus]

Are there any versioning policies for renaming an OSGi service implementation 
class which does not have any public properties (i.e. no metatype resource)?
In this case I would like to rename the classes below 
https://github.com/apache/sling/tree/trunk/contrib/extensions/resourcemerger/src/main/java/org/apache/sling/resourcemerger/impl/picker.
Can I just do that given that there is only a very slight chance that those 
properties have been overwritten by someone?
Thanks,
Konrad