Unsurprising results- calories intake & expenditure defines weight loss/gain, not other nutrition information like fat, carbs, vitamins, etc.
True; however, they may be very different practically. Few people are going to measure calories for every single thing they eat. Most will rely on the sense of hunger and urge to eat certain things. I wouldn't be surprised if low-carb diets outperform low-fat ones in that department, since carbs tend to keep people urging for more through rapid blood sugar fluctuation.
This has been my experience, and I wonder if part of the efficacy of macronutrient-centric dieting is about cultivating self-control. That would be an activity that would be hard to measure in a study where the participants know they’re participating and have a sense of duty to remain committed. Healthy low fat vs healthy low carb will yield the same results, roughly, with the same caloric intake. Any macro combination will, really. But carbohydrate restriction is something I’ve personally found to be a good way to stay on the rails.