Diet's the same. But daily calories can vary a lot. On the day of big ride and recovery the day after, I eat a lot more compared to regular training days. But the stool volume and consistency remains roughly the same.
I've been searching the internet and can't seem to find any relevant articles. They do mention average daily weight of stool production of a healthy person is 500 grams. I think that's a lot more than I'm making per day.