I have multiple listings with the same ASIN.

They have the same SKU, same ASIN, same FNSKU. I saw some posts on here that said it was okay to delete the extra, but I just tested it out and it deleted both instances.

I also have a couple listings where they have the same ASN but different SKUs and different FNSKU. How can I clean those up?

What is the difference between deleting a listing and closing a listing?

Thank you, appreciate any incites.