No, scrapple is made from pork hearts, pork snouts, pork cheeks, cornmeal, and other assorted offal, shaped into a loaf, then sliced and fried.
Pork roll is scraps of pork muscle meat, chopped and formed into roll, then sliced and fried. The three biggest brands are all made in Trenton, NJ.
Pork roll is also sold in boxes of 4 to 8 pre-cut slices.
Often, a few slits around the edges are made to prevent curling, but it's not necessary. You can grill it too.
The ultimate Jersey diner sandwich, and not just for breakfast. Pork roll, egg, and cheese on a kaiser roll. Also great on a bagel.
As to Taylor Ham vs. pork roll.