Because I assume that you agree that eating 100 calories of Pop-Tarts per hour for 18 hours for 30 days, would give you a different result than eating 3 days worth of Pop-Tarts in a few hours once every 3 days for a month.
I agree that you would feel very differently in those situations and it's likely you wouldn't spend the same amount of energy unless you really make an effort to do it.
I don't agree that if you do make an effort to spend the same amount of energy you would have different results with regards to weight loss.