A late comer to this thread. Yes, Watts' Tops are measured 4" x 4" without the point. The point adds about an inch to the height.
The same would be true of 5, 6, 7, or 8" only the point gets larger with these and therefore longer.
And yes Chris, I do try keeping my measurements the same. I know what works and have been following that pattern for many years. Let the younger guys do the experimenting which they are doing very well.