While watching my Twilight marathon, I managed to finish knitting the cables for both cuffs.
I swear they're the same length - it's just the angle that makes the front one look longer.
See - here are the cuffs, one on top of the other, and you can see that they are the very same length.
Tomorrow I'll seam the cuffs, pick up the border sts and knit those smooth edges. Can't wait!