Does using cauliflower in lieu of pasta and bread save a lot of carbs?

I just saw a photo of cauliflower pizza. I’m just wondering when cauliflower is used as a substitute for flour or bread, are the carbs much lower? As far as I know cauliflower is one of the higher carb vegetables. I assume the cauliflower has some vitamins and minerals that flower doesn’t have. Although, since it’s white maybe not very many? I guess it has some fiber too, which is good.

If you know the math regarding the nutrition and calories I’d be interested.

Thanks!