The biggest difference is in the tablet size, the Note Pro has a 12.2 inch screen and the Tab Pro has a 10.1 inch screen. The Note Pro has the Spen input, the Tab Pro does not. Other than those two items they are essentially the same tablet. I have the Tab Pro and love it, i actually use it more than my Surface 2 Pro!
I believe the only difference is that the Galaxy Note Pro uses a pen input