@Snuffbox, you’ll have to explain the difference. Here is what I know, because I ordered some.
If you click the link, it takes you to the Mr. Snuff website, and there is some Samuel Gawith Gold Mull in a 10g tap box that is featured there. That is currently the only snuff offered under this deal. You add it to you shopping cart, along with whatever else you would like to order, and then you check out. During the check out process you enter the coupon code, and it removes the cost of the Samuel Gawith Gold Mull 10g tap box from your order. You still pay for the rest of your order, and you still pay shipping for your order.
Please let me know anything that remains unclear very specifically, so I can help get the answer.
Mark