Years ago, remember we've been using the electronic fluorescent ballasts out here for nearly 3 decades now, the multi-volt ballasts were said to have a sacrificial 'jumper' that burned out depending on the first voltage is was connected to.
That made it unusable for any other voltage after.
That was then and today it's not the case (from what I've seen and read), but there's a LOT of sparky's out there that still go by that belief. Our own warehouse has hundreds of electronic ballasts in bins labeled as good for only one voltage, how many actually are is for someone else to determine.
