Ouch, Maru. EChronicle, the quick answer is that there are not actually 10 individual, distinct statments in the scriptural "10 Commandments." In order to get a list of 10, you have to merge some together; the difference in the lists is that Catholics merge a different two than Protestants do. I don't know of any sites off the top of my head that I would recommend, but Maru's link may be helpful. 

The short answer, though, is that it's just a matter of how you turn the 15 statements in Exodus 20 that form the "10 Commandments" into a list of ten. If you merge together the "first two", it's Catholic, if you merge the "last two" is Protestant.  (Talk • )