Is eating a fish the same as eating a goat? I would eat both, but the way I relate to these two foods is very different. Food is definitely more than just macronutrients or a list of foods we evolved to eat. Food has social, ethical, spiritual, and psychological aspects too.
Arguing that meat is nutritious doesn't hold much weight to someone who is sentimental about animals. And I don't use sentimental in a derogatory way. Most of us do have sentiments about animals whether it's because of pets or Disney.