Merge two databases in SQL Server
I've always found SQL Examiner to be a great tool that's super easy to use when synchronizing one database from another.
Since you said the names don't collide between entities, then SQL Examiner will basically create all the entities (which you get to choose, e.g. you can exclude all procedures, or hand pick which views, etc) in the destination database from the source database.
It also has features such as showing you the scripts it generates before executing them, creating backups before making changes, and is just an overall good &quot;comparison&quot; tool for both schema and data differences between two databases.
They give you a 30 day full featured free trial, so you can test it out for a while first before deciding to buy.
Additionally you can check out ApexSQL's SQL Compare.