I admit, i have this stupid habits of reading about this stuff on messege board, when i was looking through the possible cheap pres, i stumble across the RNP, so i went on like 4-5 different message board searching "RNP" in the tittle, lol, i basically went through hundreds of threat for comparsion of the RNP, and until this day, the only time i've heard about what components is inside the RNP was on 1 topic, unfortunately the topic got deleted for whatever reason i do not know. If i remember correctly it uses the INS163 amp (or something similar to that name, i don't have photographic memory lol, i can't remember all these stuff).
The DMP3 uses the Burr-brown INA163 opamp. I don't recall hearing that the RNP does.