I am currently reading the Douay Version. I have been noticing verses where it adds what appears to be a second verse. This is an example:
"What doeth it avail a fool to have riches, seeing he cannot buy wisdom?
“He that maketh his house high, seeketh a downfall; and he that refuseth to learn shall fall into evils.” (Douay Version)In the text you can see it has a similar beginning to the KJV. It clearly separates the second part so anyone who is observant would notice. This is not found in any other translation I checked, including the RSV with Apocrypha. I have checked the general commentaries and find no reference to this. I have seen nothing in these verses that contradicts scripture. At this point I would still stand by my position that a serious believer can use almost any translation if he is seriously seeking. The Holy Spirit will lead to truth.
The Douay would stand in the Roman Catholic tradition like the KJV would rank with Protestants. Both were translated in the same general time period. Both have been supplanted by other translations. I believe the current standard translation for Catholics is the New American Bible, not to be confused with the New American Standard Bible. Remember that the Douay Version is based on the Latin Vulgate and other texts are consulted. The KJV translators started with the other texts and gave the Latin Vulgate the minor role of consultant.
Read, pray, think, grow.