I have never heard of them. I have seen different seasoned pieces of pork at the grocery store.
I use different seasonings on pork loin depending on how we want it.
We like to rub it down with olive oil, salt & pepper & put on the grill. Before it gets finished cooking we brush a mixture of peach jam, lemon juice & honey on it. Yum!!!
If we want it to have a bbq flavor we will use Head Country Seasoning on it. We also like pork with thyme, salt & pepper. I love the flavor of thyme.