I have some good news and some bad news.
While both cards use ACX 3.0 cooling solution, FTW model appears to be slightly wider than SC, so there are at least two different versions.
EVGA GeForce GTX 1080 FTW
EVGA GeForce GTX 1080 SC
UPDATE: Guys over at HotHardware have just posted pics of their EVGA GTX 1080 ACX3 SC sample: