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What bindings? Most have some amount of travel (fks with the least at 10mm and something like a px has 6cm) so if you are within that range they can move the heel on the track to accommodate a different boot size. However, this will make the mount position slightly back (essentially the difference in bsl's of the boot divided by two) so if you went from a 300mm shell mounted at true center to a 310 mm shell, it would now be mounted at .5 cm back from true center.
Is the durability affected? Kinda. Remounting, ad putting more holes in the ski obviously isn't good for it, and puts it at a higher risk for pullouts if the holes are close together. If they are far enough apart and the old holes were properly filled, it's not bad. Most skis can handle three mounts before they are at the end of their life
Take them to a shop but it sounds like a remount would be dinette toe holes probably won't be an issue if you are moving forward and the heel will be able to move onthe track so it can be mounted away from the other holes. However without your new/old bsl's and what type of binding it is impossible to be 100%certain, so just take them to a shop