KickAssCop
Looks same as sc+ to me. What is custom about it?
Change in vrm probably, just like every other FTW. Look at the 980 chart and you can see that all reference 980's had 4+1 vrm, and 980 ftw had 6+2, not to mention dual bios, which the 980ti SC+ does not feature.
The FTW is generally aimed at air overclockers looking for a little bit better vrm and bios support over reference boards while they maintain air cooling. This is the gap between the SC and Classified. This is where most people that don't use extreme cooling like to purchase, because (aside from the 980 FTW) the FTW is normally on part or close behind the Classified while on air.