If you are talking about the email accounts inside the cPanel but using those domains that you listed and you wanna use the same email accounts on your new account, I think you can do it as long there’s no existing error message showing up then you will be fine. If it says it, let us know or if you want, create a different email addresses.
Johnny is a slowest sever and pretty much he has been running really slow for all year! If you need a better performance server, get Tommy server. Keep in mind that the next Tommy's signup button reset is not until at midnight and you have to be quick enough before it gets filled fast during the day. If you don't want to wait in line or you can’t stay up at midnight, you can consider making a donation of minimum $1.00 by visiting this link: https://www.heliohost.org/tommy/ to skip the line. An invitation link will be sent via in your email to registered. Please deleted your johnny account first by visiting this link: http://www.heliohost.org/classic/support/scripts/delete. Users are only allowed to have ONE account.