Okay, I only have limited time now, but I'll try to share a few thoughts on the "42 negative confessions" as they are commonly known.
First, they don't seem to be a very strong historical analog to the 10 commandments given at Mt. Sinai as they are not a "codified ethic" or written law. Instead, they seem to be a commonly used eulogy that declare how the individual tried to please Maat. (They also seem to be a bit less than honest, at that... "I have not committed sin.")
Another interesting thing I noticed is the directedness of the statements compared to those of the ten commandments.
The ten commandments are typically understood to have the first 4 commands relating to one's relationship with God and the final 6 relating to one's relationship with other people. I might make some argument that that the 4th (regarding the Sabath) could actually be a personal command for one's self based on Jesus' statements about the Sabath, but that's a longer discussion.
In contrast, the 42 confessions seem to have about 8 statements directed toward the gods, 21 statements regarding other people, and about 13 that seem to be regarding the individual whose eulogy it was.
The obvious thing someone might point out is that these people clearly had some idea of the general expectation for moral behavior (whether they actually followed them might be another issue). So, the 10 commandments aren't necessarily an entirely new concept. I would be inclined to agree, and the Bible itself also indicates that mankind knows the basic principles of morality without requiring any specific written law. In fact, this built-in conscience or sense of morality is one way that people can know there is a God. (Romans 2:12-16)+Keith Elias
I'm no Egyptology expert, but I know that there is some amount of flux regarding the commonly accepted timelines due to better understanding of overlapping reigns, how they recorded history, etc. So, I'm not sure whether that date is correct or not, but assuming that time span (200 years) is correct, I don't find it very surprising according to biblical history. Within only around 100 years after the flood, God had to judge mankind again at Babel because of direct disobedience, and many scholars believe idol worship was already established at that time. Certainly, archaeology has confirmed that as society spread from that area, towers and polytheistic idol worship spread accordingly. Later in Israelite history, we see these seemingly schizophrenic rapid swings often. It seems Jeremiah was quite right when he wrote, "The heart is deceitful above all things, and desperately wicked: who can know it?" (Jeremiah 17:9 [KJV])