Hi,
I can start right now.
My suggestion: Instead of testing all data we can do the data migration again and make sure that everything like Products, Customers, Invoices, Orders, etc will be moved.
For layout, I can test and will make exact copy whatever difference both of them.
I have +8 years of experience in Magento and also have +5 years of experience as a Linux Administrator.
Please feel free to ask me if you have any doubt.
Regards
CodersLogics