11-09-2018 02:07 PM - edited 11-09-2018 02:14 PM
In a nutshell, the answer is "almost". They are pretty darn close, but Office 2019 was based on the March updates to Office 365 so if there have been any other updates since then, Office 2019 won't have them and there are a few features Microsoft opted to leave out of Office 2019.
Check out these posts for more info:
The link to Corinne's webinar is at the top of this:
Hope this helps!