Differentiate between same nodes in Drupal Autocomplete Search
Few Possibilities:


You can add a content-type name along with the node title when autocomplete shows the result to describe the user in which relation it goes. For e.g., "Sandy -- Content Type Name"
You can add a Nid along with the node title when autocomplete shows the result to describe the user in which relation it goes. For e.g., "Sandy -- Nid"
Nid I don't think is a good idea. But you can also set some relative name while getting result for user to know which "Sandy" should be chosen.


Hope it will take you on the right path.