All they did was remove the enforcement bar across the lower discharge chute opening, then added an enforcement bar over the top exactly like the retro enforcement bar for the 2013-2018 add on over the top enforcement bar.
Find you a 2018 back, cut down the enforcement bar to 3/8" so that you have some safety for feet, etc. if you happen to have the blades engaged with the discharge chute open. I do NOT like the safety issue caused by removing the bar at the bottom as long as that huge grass catcher scallop still exists. The factory was supposed to remove that scallop for '19. They went the cheap route and left it.
I figure the first person to have their foot mangled or removed by a blade tip will end up owning the manufacturer due to their knowledge of the dangers and continued to manufacture the deck with such a huge foot trap.
Anyhow, that is the deck change. You can disregard my editorial.
Max