My point is exactly that it's drive that differs, not metabolism. For the latter, see e.g.:

https://examine.com/faq/does-metabolism-vary-between-two-peo...

Metabolic rate does vary, and technically there could be large variance. However, statistically speaking it is unlikely the variance would apply to you. The majority of the population exists in a range of 200-300kcal from each other and do not possess hugely different metabolic rates.