It is normal for the bar code on the shoe box of Nike shoes to be different from the bar code on the shoe label. This is because the bar codes of shoe labels and shoe boxes use different code systems. The former is a UPC code and the latter is an ITF code. The UPC code is a unified product code, while the ITF code is an international tracking code, which is mainly used to track and query the production information and logistics information of the product.

To identify whether Nike shoes are genuine, you can use the following methods:

1. Check whether the UPC code on the shoe label matches the ITF code on the shoe box. If they match, they can be preliminarily judged to be genuine.

2. Check other details of the shoe logo, such as fonts, letters, numbers, barcodes, etc., to see if they comply with Nike's specifications.

3. Check the details of the shoe box, such as the lid, bottom, side labels, etc., to see if they comply with Nike's specifications.

4. Scan the QR code or barcode on the shoe label through Nike’s official website or APP to verify the authenticity of the shoes.

In short, the inconsistent barcode on the shoe box and the barcode on the shoe label does not necessarily mean that the shoes are fake, but other identification methods need to be combined to confirm the authenticity of the shoes.