In addition to the email address, Stripe and WooCommerce Subscriptions also share the customer ID: cus_ABCdefxyz and the card ID: src_1234ABxyzasdf and transaction ID: ch_0123ABCDefgh
IIRC PMPro also shares the same.
The way to go in my opinion is to export a table from both apps and confirm they match up in a spreadsheet, then use that csv file as the source.