Is the soya lecithin has the same side effect like soya bean oil for g6pd?

Possibly. Different people with g6pd deficiency are affected to a greater or lesser extent. Those who are very sensitive need to avoid all soy products completely. Better safe than sorry. See: http://g6pddeficiency.Org/wp/living-with-g6pd-deficiency/g6pd-deficiency-foods-to-avoid-list/#.Ugbotpi3uag.