Automatic copy node from Drupal A to Drupal B
I would solve the problem with either of the following

1) Write a 5 minute custom php script that would show the node ids and data value and then update the nodes with data value in the second database with a simple update query on field_data_field_&lt;your-field-name&gt; table based on entity id.

2) Use services 3 module to expose your data and then import that field with put method with only the field you want.