Cats do not have the long digestive tracts of ruminants to efficiently ferment raw starch or fiber, but that doesn’t mean they cannot digest plant matter at all. It also does not mean they are unable to obtain any nutrients from plants or from fiber.
https://rawfedandnerdy.com/what-is-an-obligate-carnivore
True, but just read a 3rd grade biology textbook. you’ll see how plant eating animals usually look fatter with how much more bowels they have.
They work the same (mostly), but you just need more of it