You can't use the same email address for 2 Apple IDs. You need to get another email address for the new ID.
Note the restrictions in the article.
Apple ID Name Change. *
What to do after you change your Apple ID or password - Apple Support * I suggest doing this before you change your Apple ID or password.
Apple hasn’t published any guidance for using an address again. Normally, if your e-mail address was associated with an ID in any way, then it can't be reused as an Apple ID email address for approximately one year. I have also seen posts that stated Apple told them there was a 30 day waiting period before the address could be used again. You will need to get another e-mail address from somewhere like AOL or Yahoo to use as your Apple ID or you can try waiting 30 days to see if that works.