I have two tables in an Oracle SDE database. While table A is registered as versioned, table B is not registered as versioned. Both tables are in the same schema. Is it possible to create a feature service with both tables, and apply edits to both tables via the service? Or is this "mixing" of versioned and non-versioned datasets not supported?
This is supported. However, if these are truly tables, and not feature classes, you will need a feature class within your ArcMap map/ArcGIS Pro map to publish the tables as services.