It becomes much easier between other versions.
Though upgrading 0.12 to 0.13 I remember, i had to pull the state and change the provider field manually to avoid recreation of some resources.
Terraform 0.14 is pretty much fully compatible with 0.13, so no such command is necessary. All you have to do is make sure your state is for version 0.13. Outside that it's a bunch of usability changes that do not affect your tf code.