Hmm, interesting indeed! I get what you're trying to say, but I would also tend to believe that it's still the same animal? If not that, then wouldn't the caterpillar cease to exist when it metamorphosised into something else?
"Caterpillar" is not a species. It's a stage of some animals' life cycle. It means 99% of catepillars die before they become butterflies or moths or whatever
I wish it were 100% in tomato hornworms. Seeing that 99% of them die before turning into moths makes me think all of the surviving ones just hang out in my garden.