Is there a way to find pick actor index from vtkActorCollection?

I have imported actors and added to vtkActorCollection. Then I implemented a vtkPropPicker. Now I want to know the i’th value of that picked actor from that vtkActorCollection?

There is a vtkActorCollection method vtkObject* GetItemAsObject(int i) to return i’th object from vtkActorCollection. Is there any method which finds the actor from vtkActorCollection and returns the i’th int value?

If I have to do it manually, then how to check if two actors are same? Comparing paths?

Can I use vtkInformation for this purpose?