Carbon fiber is one of the last. LAST. Things you do for reduction.
Your talking around 20lbs per fender and around 30lbs for the hood in general. So yes a nice 70ish pounds off the front. Nose and bumper can reduce around another 70lbs. But there are so many other areas to tackle before you put a "sensitive" carbon front clip on the thing.
It depends on your application. I would never run carbon on the street. I will cut the heck out of some steel fender and hood supports to loose weight well before going carbon. Even pulling out steel and replacing it with aluminum in some areas.
There is a long list of items to tackle before playing with replacing body panels. Weight reduction is done by the ounce not by the pound. If you want to loose and better redistribute weight look at the things where your weight really hurts you. Battery, suspension, heavy items attached to the frame that can be changed, ac, steering shaft, exhaust, anything chrome, etc. Just to name a few.