As you cannot instantiate deformers (they do appear but don't do anything) I would say the only way is to create a second deformer for the "other" object, and use XPresso to connect that deformer to the "original" deformer.
The scope of a deformer is set by the parent object or parallel objects in the same hierarchy, not explicitly by some slots (like effectors), so it's just not working like Maya I'm afraid.