when I did, I used the different email to registered because so many people said using the same email, the system doesn't allow !
After used the different email to activate the JOb bank, maybe a few months later , you will receive email about "the job bank deactivate your both job match accounts. Nothing effects your EE acount! All you need to do is login the one you want to keep it. After 30 mins, the account will activate again.