Comparing your old pair with a new pair, does not make either pair a fake, and if so which pair is the fake.

Unless you are an expert on Dr Martens shoes, and authorised  by the brand to declare an item fake, then your claim is meaningless and you will have to have  the items certified by an  authorised Dr Martens representative.

You can always raise your concern with the seller, in private, or research your responsibility regarding naming, shaming and defamation.