The physical layer is easy - mostly just plastic and metal contacts, as well as minor electrical differences. The reliability and payment layer is where Tesla has way outperformed and it will be interesting to see if Ford can support that with their "Ford Pay" system.
[0] https://www.youtube.com/watch?v=240R6RhLGj0
[1] https://www.consumerreports.org/cars/ev-chargers/how-well-do...