i just bought the pro one to see what you're talking about, in the screen shots - my calculator and dialer didn't look the same either.
Sadly, after some searching i found a thread, and the author said this theme wasnt made for the iphone 4, and he isn't sure if he's going to be updating it to work. He also goes on to say to get his theme ELITE HD or whatever. I'm not too keen on shelling out another couple bux after seeing this one fail after paying for it. Here is the thread and some of what he has to say if you want to read any: