If I make changes to a workflow and deploy essentially version 2. What will happen to all the open processes that were created under version 1? Will they continue to work just like they always have? 

In my first version, groups of people got tasks assigned. In v2, the submitter selects recipients from a drop-down list.

Also, in v1, there was 1 less step. The task would go to a direct supervisor, then to a group manager. V2 has another recipient between the direct supervisor and the group manager.