I have the Iquitos vents, but not the red amazonicus so I can't tell you any differences between them (thought I imagine there would not be much since I believe they are very similar if not from the same locality, just without definitive locale data.) My Iquitos vents are great frogs. They were very shy for awhile, but after about 2 years now of being in a heavy traffic area they have become pretty bold, about the same as some of my auratus and tinc juveniles. One older female in particular doesn't even care if I open the top to do tank maintenance, while the other two, which are a bit younger, are out and about and just hide when I open the top. The male has a nice call and I can see their strikingly bright colors from across the room easily.
Bryan