Hi izzywizzy
Welcome to Support Forums
You cannot have the same email address as your BlackBerry ID on both of your devices , because this newer BBM version integrates with your BlackBerry ID.
So if you remember your email and the password of your BlackBeerry ID then from a PC go to www.blackberry.com/blackberryid first try changing the Username or the email associated with any one of your device , for further help refer to this Knowledge Base :
KB28060 : How to change or update a BlackBerry ID username on the BlackBerry ID website.
Please try it and see if that resolves your issue.
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