Deleted accounts are just that, deleted.
Any personally identifying information is removed and the posts from that account are effectively orphaned. They have a generic username attached to them but are not linked to the (now nonexistent) profile that created them. Creating a new account does not recreate any information that can link the posts to you.
If you hadn't deleted the account then you could have merged them using the contact form where there is a system for merging accounts already set up.
If you really, really, really want those posts linked to your new account then you should use the contact form and speak to the Stack Exchange team about linking those questions to your account. They may be able to help you but there would be some tricky work behind the scenes so this isn't something to be done lightly.
Otherwise if the questions are not all that important, especially the deleted ones, then you may find it easier to just ignore them and move on.