They are remarkably expensive, but 'microchip reading cat feeders' do exist, that only open for the pet with the correct chip in their back. There's a token for their collars if they're not chipped, too. Made mealtime with our three much less fraught - we'd have ended up with one spherical cat and two rake-thin ones, otherwise. Also make medical treatments easier - you know who's the only one who could have eaten it.

https://www.surepetcare.com/en-gb/pet-feeder/microchip-pet-feeder