I have Paul's voice, and both those sites sound normal to me - exactly as expected.
The difference you're probably hearing is in the compression that the site is using to deliver the sound to you. Also, it sounds like the translation site may also be playing Paul's voice back to you at a slightly faster speed, which tends to make Paul sound a little more natural in my own opinion.
You can control these aspects yourself as well. Paul's pitch, speed, and volume can all be controlled in whatever program your using if the program allows you that control.