Two accounts for the same domain

Two accounts for the same domain

I created an account for my domain, setup hosting and all is working perfectly.  I used <firstname>.<lastname>@<mydomain> as the account administrator

I forgot that I had created an account earlier with <firstname>@<mydomain> as the administrator, but not completed it as the domain registration process was still in train.

So of course when I wanted to add <firstname>@<mydomain> to the new account, it wouldn't let me.

If I delete the account <firstname>@<mydomain> from the old incomplete account, will I be able to use that email id in the new completed account?

Thanks.