Don't sweat it. Unless both your theme has these, and you've populated them for all your products, it's just that - a warning. Nothing bad will happen, and these are not required bits of meta data.
I have the same issue in search console. But this issue can be resolved in Merchant center. Create a Feed Rule in Merchant Center and set the "identifier exists" to "No". This will hopefully remove the warning in Merchant center.
I am still looking for a way to remove this warning in search console.