The ZL-1 retains the same front end due to airflow, cooling, lift, etc.
With that said, I REALLY like the looks of the 1LE -I actually think it looks more agressive and more refined than the previous version. I also like the tail lights a lot. I agree that the rear diffusor looks odd but it will certainly NOT keep me from getting one (I am more excited now than ever). I've had my heart set on a ZL1 but i really like the new looks of the 1LE. GM may have just saved me some money as I really like the refresh... Now, I just need to see the color of the new "Yellow"...