Can you use the same holes? Yes. Should you? I wouldn't recommend it if you don't go about it correctly. It all depends on how you go about it and whether or not you know what you're doing. If the old bindings were over-torqued or the holes in the ski are too big (for whatever reason) and the screws can't get a bite, you'll rip the binding out. If you decide to try and remount them in the same holes, you should use a quality epoxy. I've used steel wool with epoxy with mixed results in the past. I've never had bindings rip out using that method, but I have had a couple mounts that I wasn't comfortable sending back onto the hill. If you can't tell a solid mount from an ehhh mount, the steel wool/epoxy or just epoxy method can be a little iffy. If that epoxy method failed, helicoils were used or the bindings were just remounted a bit forward or back on the ski, with the latter being the best option.