just because it says organic doesn't mean anything.
It has to be OMRI listed to be classified as organic.
I know miracle grow sells an "organic" potting mix with time release ferts in it
honestly in my opinion soil is soil. even with a small amount of time release ferts, its not going to hurt your cham as long as you keep the cage clean, keep the top layer covered with top soil , hydroton, or river rocks.
also keep in mind the type of plant you are planting and its requirements
you wouldn't want to put a ficus plant in a mix with low porosity as they don't have much water or light requirement , where as some plants to need constantly stay damp so if you used the same mix, you would need frequent waterings and vice versa