|Not even close...|
Do you need both? Well, there's no denying that they are both very festive and if you do a lot of partying over the holidays, or if you just like gold, then you might want both. If I had to choose I think I'd go with Ziv because the finish just seems classier and less Vegas showgirl, although I have to say that I was pretty impressed with Gilded Lily until I tried Ziv, so maybe I'm just fickle. Gilded Lily is a brighter yellow-gold so it might come down to which gold looks best against your own skin tone.
In any case, happy holidays!