Why does refferencing by ID kill everything

[Kofr]

Hello guys,
There is a question I have not found explamation on.
If a SuperComponent has property Component style
and when I instance

ContainerComponent
{
   SuperComponent 
   {
   style: StyleComponent {} //everything works
   }
}

But if I do something like this:

ContainerComponent
{
   SuperComponent 
   {
      style: styleComponentId //errors
   }

   StyleComponent 
   {
      id: styleComponentId
   }
}

How does referencing by id work?
And is id refferencing the same as direct linking in QML?