"Differences between Christians over the enumeration of the Ten Commandments shouldn't surprise us. The Bible itself gives slightly different versions of the Decalogue in Exodus 20:1-17 and Deuteronomy 5:6-21. In Exodus, a man's wife is ranked with his possessions as part of his household. In Deuteronomy, the wife is distinguished from a man's possessions.
If you follow Exodus, the prohibitions against coveting a neighbor's wife and his property could be counted as one commandment. If you follow Deuteronomy, they could be counted as two separate commandments. This is mainly a difference in emphasis.
If the biblical number ten is to be maintained (Deut. 4:13; 10:4; Ex. 34:28), then what is given as a single commandment in one book must be divided into two in the other. Catholics and Lutherans generally follow Deuteronomy in counting prohibitions against coveting another's wife and property as two separate commandments.
Most Protestants count these together and regard the prohibitions against idols and the worship of false gods as two distinct commandments, which Catholics and Lutherans regard as one.
Interestingly enough, modern Jews take a third route. They separate the introductory phrase "I am the Lord your God" (Ex. 20:2; Deut. 5:6) from the prohibition against false gods and idols, which they count as one commandment. The commandments against coveting a neighbor's wife and his property are listed as one prohibiting covetousness.
Catholics, Protestants, and Jews accept the entire Decalogue. What they differ on is how its components should be numbered, something which, in view of what is held in common by these three groups, is unimportant" (Catholic.com)
Reference:
Entire article taken from Catholic.com (Q & A). Why is there a difference between the Catholic version of the Ten Commandments and the Protestant one? Interpretation of text in the above listed section or manipulation of the verbiage would have alluded to a different meaning.
