I think the Kode 80 is a liter or two below quoted (which didn't stop 90kg Kevin P from putting around pretty good on it with a 5.7 at the Cabo Verde WC event). I think the EVO 75 is pretty much spot on 75 liters.
It is VERY difficult so say which one of these you will feel is the earliest planer and the has the best control. They ranges are simply to similar while the styles are rather dissimilar. So it is likely that your personal sailing style and preferences will mean more than any "objective" difference in performance.
If you can say some more about the conditions you will use the board in, we might be able to better explain the difference between the two.