Loss data/report due to 'overlapping' leads - how to restore?

Hello Marketo Community,

I uploaded List A for my campaign and sent it out in the morning. Later that afternoon, I uploaded List B to same 'List asset - where List A was uploaded' - I supposed the list has been overlapped now. As a result, I can't seem to locate any reporting for the email sent to List A earlier in the morning. Is there any way I can restore any reporting/data from the first send?