Yes you should treat them as separate users, because there is less chance of you doing something wrong. What you need to consider at sign ups are more than jus

Yes you should treat them as separate users, because there is less chance of you doing something wrong. What you need to consider at sign ups are more than just an email to distinguish. Ex. if name, address and phone are the same, but the emails are different, chances are you have the same person and thus you can assume it is the same person.