As long as your existing 328 boots fit within the Salomon Guardian bindings size large (305 - 360) and you get new boots with the same sole length or within the 305 - 360 range then you will not have to re-drill unless of course you are placing them on a ski with different bindings already mounted.
We just reviewed this binding with a video here.
The full written review should be live on the site within the next week or so so keep checking the site.