Does anyone know if the two following Bibles are exactly the same translation ?
. Holy Bible Catholic Edition : The New Revised Standard Edition - Publisher: Thomas Nelson - ISBN: 071800695X
. The Holy Bible Containing the Old and New Testaments: Revised Standard Version/Catholic Edition - Publisher: Ignatius Press - ISBN: 089870491X
I am familiar with the Ignatius Bible, but was curious to see  at a bookstore.
Welcome to the forums.
There is a BIG difference.  is the New Revised Standard Version, supposedly an update of the original RSV. However, it uses sweeping inclusive language, which seriously affects the theology.
 is the classic RSV Catholic Edition. It does not use inclusive language and is lauded by orthodox Catholic scholars as the most accurate modern translation available. However, the Ignatius Bible does ot have section headings, no study notes, and uses archaic “thee’s, thou’s, and thy’s” when referring to God, but regular pronouns everywhere else.
Between the two, I’d get the Ignatius as my primary study Bible, and if ever you get the NRSV, only as a cross-reference.