C.O.
The Bible is the Bible. Whether it's King James or another version.
If you have been going to church with your boyfriend - you would see that there aren't that many differences - Catholicism - the seven Sacraments
in the Roman Catholic Church;
Baptism
Reconciliation
Communion
Confirmation
Marriage
Holy Orders
Sacrament of the Sick
The Lutheran Church is also sacramental and observes Baptism and Holy Communion as sacraments. Confession/Absolution (or Reconciliation) is sometimes referred to as the "third sacrament" in the Lutheran Church.
If you have questions regarding the Catholic church? The BEST place to go is the Priest of the church your boy friend attends and get your questions asked.
Faith is a VERY personal journey. I don't know you, your beliefs, values, morals or anything like that. So I can't tell you something. I can tell you the basics - as to the "deeper" things? You really need to go to the Priest and attend their Bible classes to learn their way.