I think it largely depends on your company.

Many places they are one and the same. The DBA designs the databse, supports production, and reviews code.

Some places they distinguish between Prod DBA and Development DBA. And in some of those places it only means that the development DBA works more closely on Projects more frequently and has to back up the production DBA.

And yet in other cases, there is a thicker line drawn as to what each group does.