Fluent Assertions 6: Comparing two collections with different members types and names

In the previous versions of Fluent Assertions, there was a possibility to compare two collections with different members types and names by creating a class which implements IEquivalencyStep: https://stackoverflow.com/a/55898570

Unfortunately, version 6 changed this interface and the trick does not work. Is there any workaround for this kind of comparison in the current version of Fluent Assertions?