I think i know the answer... the main one, as people said is face butter is a tad lighter. However. i noticed a BIG difference. and o one talks about this.. is the body butter has a SHEEN to it. . a VERY slight "pearlized" sheen... so you probably dont want to use liberaly on your face. unless you like that sheen. Use them side by side on your hand, you will see FB is a tad less heavy.. i havent looked at ingredients, but im sure they are somewhat different.. but you will SEE the BB has that pearl sheen to it, subtle though it is, its best not on your face... unless you like that..