What is the difference in MD328LL/A and MD328PP/A models of iPad?, What is the difference in MD328LL/A and MD328PP/A models of iPad?

I just bought a new iPad, and noticed that the code at the back of the box is kinda different from the post in other forums.

Mine was MD328PP/A, and read that the code for an original iPad (the new ipad, wi-fi, 16gb, white) should be MD328LL/A.

Did apple have a new release? Or I just bought a fake one? (I hope not)

Please enlighten me guys. Thanks in advance. 🙂