>>>Update. Found this https://github.com/FortAwesome/Font-Awesome/wiki/Upgrading-from-3.2.1-to-4 - will try to follow.
>>>
>>>Hi everybody,
>>>
>>>Does someone have a link that shows the old names for the icons and new names for the font-awesome icons? Apparently, they renamed all the icons and I'm going to fix all our references in the application but this cheat sheet would be extremely helpful.
>>>
>>>Thanks a lot in advance.
>>
>>Why don't you ask them?
>
>Do you mean Font-Awesome team? If so, do you have a link where I can ask that question? Also was hoping someone here may know.

Seems to me that on the link you posted there is a section showing new icon names. Seems to show old name and new name. Did you read it?