Yes, but if you imagine the dynamics, the cat chomps down on the prey's neck (which unlike anywhere else is narrow enough that it can open it's jaws wide enough to stab through) and just the natural struggle would let the serrations do their work. The cat wouldn't need to cut all the way through the neck - as soon as the arteries are cut then the prey will weaken and bleed out, which seems to be a fairly common MO among some predators.