Pedro and Peruvian along with pretty much all other LEGAL cacti (for me) produce the same high. I've done fresh peyote once, a 14 year old button that I'd been caring for, and it was by far, the most visual mescaline trip I've ever had; comparable to my favorite lsd trip. I've done dried peyote at least 5 times and it's always felt just like a san pedro experience; very relaxed, cosmic, connected feeling. The fresh button was much more intense, closer to a mushroom trip because I wasn't able to think clearly, it was quite overwhelming but very enjoyable in the end.
I used to think that I had done pure mescaline; when I was younger, I used to buy micro-dots at shows all the time and was told that they were mesc. A couple years ago, I read on erowid about the "micro-dot myth", so I don't know what those things were, but DAMN they were fun!!