You don't want to do that. Pig hearts are notoriously less durable (soft tissue tends to fail quickly, like in a fraction of a decade), so there's not a lot of data on the longevity of the circulatory stability of porcine hearts. I wouldn't ever get a porcine or cadaverous tissue transplant - as someone who pays close attention and has been living with an artificial valve for decades. (Human-) Cadaverous scaffolding, sounds ok on the surface. Let's see how much of it and specifically what parts are left intact after the growth process.
They do. Porcine hearts are a more reliable, consistent, and easily obtainable source for decellularized heart matrix. It's a great tool for experiments to develop the technology. Transplantation however is a different story.