databases cross references baselines
I know cross references between schemas/databases are commonly used in Oracle and now in MS-SQL as well :)

DBmaestro TeamWork (where I work) provides database enforced change management which consists of:

Database enforced version control – enforcing the version control process on the database objects.

Database baseline impact analysis – generating delta script (between environments) utilizing version control labels

and it does support cross references between schemas (Oracle) and databases (MS-SQL).

For more information on database enforced change management you can read our whitepaper