Hi Grace.
Thanks for your participation.
The biggest difference between the two is the inclusion of the "Apocryphal" books in the Roman Catholic versions. These are books that nearly all other Christian groups do not accept as legitimate contributions to the revealed Word of God.
There are many English versions of the Bible. Translators used different criteria for making the decisions they did, but each was endeavoring to communicate what is in the ancient texts. None, apart from the Roman Catholic versions, are proclaimed to be the property of one group or the other.
The Roman Catholic versions are translated from Latin texts, which were in turn translated from Greek texts. The Roman Catholic church has its reasons for holding Latin texts as more sacred, but going back as close as possible to the original makes more sense to me.
All that said, other than the inclusion of the apocryphal books, there is not a lot of difference in the texts of the versions. The Roman Catholic versions have side explanatory notes that vary significantly from what one might otherwise pick up from the text, but the text itself is not all that different.
Bless,
Ken Brown