There are only Ten Commandments.
However, there are traditions as to what these Commandments mean. These traditions were passed down from the Old Testament and used to form an examination of conscience used to assess how we measure up to the Ten Commandments. Of course, it has changed with the times. One never had to worry about internet naughties before there was an internet. Jesus Himself never told us we could disregard all the traditions. There were some rules He superceded, and He clearly tells us about those. However, not all the traditions were thrown out or there would not have been any argument in Acts regarding whether or not the Gentiles should be circumsized.
I started out Episcopal, and then switched to Lutheran. I never saw an examination of conscience, nor was I aware of them until I became Catholic and had to confess all my sins since my baptism as a baby.
As a Protestant, I would peruse the Commandments occasionally, and assess myself as a pretty good Christian, actually. I mean, after all, my husband and I would attend church services, when it was convenient, we never killed anyone, and neither of us ever slept with anyone else. Good Christians, right?
The first time I read through an examination of conscience, I realized, that, in fact, I actually SUCKED at being a Christian. It was quite a shock, LOL! All those verses about ‘many being called but few will be chosen’, and all other references to the difficulty we humans have trying to achieve holiness, started to finally sink in.