Dialogflow python client versioning

I am using python client for accessing dialogflow's functionality.
My question is: does

import dialogflow

and

import dialogflow_v2 as dialogflow

have any difference?
As per my experience, all the methods are the same. In the samples given by Google, import dialogflow_v2 as dialogflow has been used and I could not see any difference between the two.

Please note that here I am talking about version v2 in python client, and not the dialogflow API version.