OK Maybe this can help you . In my restaurant meat lasagna is just that no spinach and it has been made that way for 30 years.
The veggie Lasagna has spinach.

Now my mother has made lasagna for 60 years and her mother for the same from Bologna. That recipe during the holidays is used with spinach pasta sheets made by hand and is a meat lasagna. I am no big fan of spinach but the spinach pasta noodles give the lasagna a very different taste.