The latest version of nopCommerce 3.5 up to date does not support product attributes or specification attributes that can be changed by stores.
However, individual products may be limited to individual stores. Therefore, in this case, you need to create two products with the same information, but with different attributes, and restrict their access to the repositories.
If you really want to customize, you will need to edit the ProductBox view, and I think the Catalog controller will start. For example, where product attributes and specification attributes are loaded there, you might consider adding filters to stores.
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