Yeah, so something you should know about vegan cat food, is that none of them properly fulfill all the cats needs. They can claim it, and they can potentially even keep a cat alive and mostly nutritionally balanced, but it varies from cat to cat, and food to food.
And honestly, they are obligate carnivores. Just because you might be able to safely feed certain cats vegan foods, doesn’t mean that they should be.
And no, cats that eat vegan are absolutely not going to have equivalent or better health results. You’re literally feeding them things they weren’t designed to eat.