Is the serving size of 1 cup chopped lettuce that is 57 grams equivalent to a 1/2 cup of vegetables?

Hello,

Is 1 cup of Chopped Iceberg Lettuce that weighs 57 grams, listed under the NCCDB source, equivalent to a 1/2 cup of vegetables?

I have the same question regarding Green Leaf Lettuce. At 1 cup, chopped, it weighs 36 grams. Is this amount, 36 grams, equivalent to a 1/2 cup of vegetables?

Thank you. And with much appreciation.