[exogen]

I'd say it's more like comparing a horse to a car:

Horses were never really "vehicles." We just misappropriated them that way, because they just happen to be big and move around and we can sit on them. Cars are purpose-made to be vehicles for humans.

If a designer shows you their wireframes with their grid lines drawn on top of it, I don't think many people would think "ah! so it's like in a science paper when they're printing the raw data from their experimental results in tabular form."

The fact that some web developers consider them alike is a historical accident.