Yes and no. Maybe its worth describing some things that influence weight.
They all have one thing in common - the need to physically push a steel chain to one side or another. That requirement pretty much eliminates anything except steel as a cage material simply due to wear characteristics of the metal. However, the direct mount front derailleurs will weigh less than the models than clamp to a frame, and models with steel clamps will weigh more than models with alloy clamps.
Any derailleur designed to handle narrow chains will have a narrower cage and therefore be marginally lighter.
Suggest yo try a few different models if your friends have them on their bikes. There is a slight difference in the effort needed to shift between some models and that may be more interesting than any weight differences.