If you are open to an addin, I would recommend the free PowerQuery addin from Microsoft. This would allow you to consolidate the two tables using a merge query that you can then crosstab.
You need to start by changing your two tables into Excel tables. Then you can use PowerQuery to query each table. Then link the 2 together & add new columns for the diff's.
Worst case would be that you would have to add a new column joining your two index columns but the whole point of PowerQuery is that it is an ETL (Extract/Transform/Load) tool so it allows you to do these kind of transforms in stages.