Yes, changing the names there will cause the data to fail being saved in the new post.
You will need to use either an acf/save_post (http://www.advancedcustomfields.com/resources/acfsave_post/) filter of an acf/pre_save_post (http://www.advancedcustomfields.com/resources/acfsave_post/) filter.
In the filter you can then get the values from the submitted fields and put them into an array with the names that you need to send to the 3rd party before sending the data.
