VB.Net SQL Query 2 Tables Different Databases

Good Day Experts!

I find myself in a bit of a jam here.  Long story short I need help with a query in which I need to join a table in a different database using data on the record from the first table.

Invoice --> 1234
Account --> ABC0101
Table --> Staging
DataBase --> A

Orders --> multiple records
Invoice --> 1234
Database --> ABC0101
Table --> Orders

I am having trouble figuring out how to use the Account data from Staging table as the Database for the second table so I can join on Invoice.

Is this possible? Databases are on the same server.

Thansk,
jimbo99999