While Klop inherited a bunch of pretty average players, they did actually have a style of play under Rodgers, a 'system'. They played on the front foot, they played attacking football, they pressed, they played a high line. All aspects of the game Klop came in and utilised, tweaked, made better. They also played a back four.
On the other hand, Amorim is inheriting a team that barely knows the basics, struggles to string a few passes together, poor off the ball, poor in every aspect of the game. Its like they've never been coached.
Nobody knew what the system was under Eth, they knew what it was under Rodgers though and Liverpool appointed Klop knowing he could enhance what was already being done.
United and Amorim is a full reset, not just the football, the formation and the culture are being ripped up and rebuilt.
Huge difference.