Merging 2 Databases..?

Once you create the empty database I also recommend you do this to manage the ingestion since as Kristen indicated there could be duplication of identity column values

  1. when creating all of the tables in the new database I recommend the following
create table employeesStaging(employeeid IDENTITY(1,1) NOT NULL, **Emp_ID** int not null, sourceserver varchar(50),  ...

So you first stage things in employeesStaging. When ingesting the employees data from both server01Quattro, server02Quanttro you preserve the Emp_ID values that you can use as reference to the respective sourceserver. The sourceserver is there for breadcrumb purposes and in case there are, which I assume there will be, idential Emp_ID across both servers.
Also you will have to make sure you do not create duplicate employees. There should be something that uniquely identifies them such as socsec# or some other unique value that should not be across servers.
So you do the same thing for other tables by staging them first and populate it you final tables