The theory should be the same, because futures will be delivered in the end. But there are some charges for delivery, such as delivery fee, transfer fees and inspection fee. In the end, it may be different from the spot price, and the physical prices in different places are also different.

In addition, even soybean meal cannot be traded, which is equivalent to a soybean meal index.

I'm from the futures company. Please discuss in detail if you have any questions.