we want to launch a new product under one brand that we own. can we change the brand name of that one asin from abc to zzz later? both brands are own by us in case?

We have an established brand with over 400 reviews on our product listing, and we have been a registered brand on Amazon during that time period.

Our listing brand name is "NJ Leatherworks", but our registered trademark is just "NJ". We recently tried to set up A+ content for the first time and it was removed due to this brand name conflict.

Amazon support advised that if we change the brand name our entire listing will be deleted and we would have to create new ASINs with the new brand name.

Are there any other ways to work around this without deleting or affecting our current listing and getting the brand name to update?

We have been selling on Amazon for several years, our own products under our own brand.

There are now 2 sellers who have almost duplicated our brand name (changing a letter) and selling competitive products. When we search for them, they are not even a company with a website, but certainly a distributor who has seen an opportunity.

We can do a cease-and-desist letter, but is there any recourse in Amazon?