Umm, a little bit different
설탕 조금만 넣어 주세요 Plz put little sugar.
설탕 조금만 주세요 plz give me little sugar.
.former one you can say it in a restaurant or ask something containing sugar.
and later one is directly meaning give me sugar, not other forms.
Well but even if you confused them, those all have a meaning that you want little sugar, so maybe the opponent will understand what you want^^