Yes, in PRP they take your blood, extract platelet-rich plasma from it and inject it into your joint.

With SVF they make you a small liposuction (around 80 ml if I am not mistaken, local anesthesia), then also extract cells from it that are similar in function to stem cells and inject them into your knee.

PRP is very noninvasive. SVF is more invasive, mostly the liposuction part, but I'd say it's still walk-in the part if you compare it with something like arthroscopic surgery.