Harrell completed 13 of 15 passes for 223 yards with two touchdowns in both teams' final tuneup Thursday night.
Alex Green had touchdowns rushing and receiving, and Jarrett Boykin caught a touchdown for the Packers.
Peyton Hillis had 46 yards on six carries early on and the Chiefs rushed for 247 yards.
Defensive tackle B.J. Raji appeared to hurt his left ankle on the Packers' first defensive play, but was able to walk off the field without assistance.