Comparison of data tables

What is an effective pattern to allow users to compare two or more data tables with multiple (i.e 4) columns in each table?

For example, we have a table with 4 rows and 4 columns for geographic revenue across last 4 years for a company ABC, now I want to add another company to compare (or possibly multiple companies).

In this case, how do we show this second table to compare values with the original table?

It's easy when we have only one row or column but in this case, we have more than one rows and columns. Any example would be helpful!