No. Honestly, software defined networking is the idea of replacing all of your networking staff with a very clever distributed Java program. Half the world thinks this is genius and the other half thinks it's a facepalm.

Network Functions Virtualization is the idea of replacing networking boxes (Cisco, Juniper, Ericsson, F5, ...) with virtual machines running on your own PCs. This is basically a "private cloud" but with emphasis on doing networking in a way that doesn't annoy ISPs.

Rest assured that Software Defined Networking will be redefined to mean whatever the next good technology turns out to be :-)