The same caloric deficit, not so much. It just means that they metabolize more per day. The more mass you carry, the more you metabolize. Also more muscle mass contributes to higher metabolism. Basically, if you were to eat 1600 kcal per day and some arbitrary fat eats maybe 3300 kcal at stagnated weight gain (which rarely happens of course; usually fats just keep increasing their caloric intake) and you each drop about 300 kcal per day (you at 1300 kcal, fat at 3000 kcal) , theoretically, the weight loss should be about equal. However, if both switch to a 1300 kcal diet, the fat would lose weight significantly faster than you. However, take my words with a grain of salt. I've taken upper and lower division college courses in relevant topics, however, I study statistics, not biology/anatomy/kinesiology. Used to be biochem, but I like prob/stats so much more.