Rename field name in a CDT to match with the database one

I want to change the field name of a CDT to match the renamed field in the database. The old name was "FIRSTNAME" and the new one is "FIRST_NAME".

Related to the best practices, the best way to do so is to download the CDT as XSD, change the field name in there, and re-upload the XSD, verify and publish the data store as a last step or is there any other best practice thing?

Thanks in advance.