What is the difference between Cambridge English First and B2 First?

The name has changed, but it's the same test

There aren't any! It is the same test , but the name was changed a few years ago (in 2017).

THE B2 First is therefore the new name of Cambridge English First.

Preparation for the B2 First test

To see all the names of the Cambridge English tests that have changed, you can visit the official Cambridge website.