No. They offer two different use cases.
Your new error means you have been rate limited. 5 certs / 7 days for any one domain.
You can and probably should use the staging server for testing and figuring this out. In the new client, that means (I believe) specifying the cmd line option:
–test-cert
Or
–staging
I haven’t tried this myself (staging). Only reading the help output from letsencrypt-auto.