Load multiple excel files with different structure

Hello Everyone,

I have three excel files with different structures. See below.

Table : 1 
AuditID TransactionID Date Name XXX XYZ

Table : 2 
AuditID TransactionID Date Name YYY

Table : 3 
AuditID TransactionID Date Name ZAAA ZBBB ZCCC

Output 
AuditID TransactionID Date Activity Activity_Value

The Activity column has all the non-matched column names from the above 3 tables, the Activity_Value column has the values of it.

How do i achieve this? The structure of the excel files will be changed on a daily basis.

With SSIS foreachloop, we can't achieve this because of non-matched columns of all the excel files. Any other solution for this?

Thanks in advance,

Pradeep