Web API End Point Best Practices

Hello Everyone

What is considered best practices for creating web api(s)?

e.g http://<servername>:<port>/api/<version>/Customers, http://<servername>:<same port as cusomters>/api/<version>/orders

or

e.g http://<servername>:<port>/api/<version>/Customers, http://<servername>:<different port than customers>/api/<version>/orders

All the web api(s) are for same application and no one else will use these web api(s).

what are the pros and cons of each as well?

Thanks