Is there any difference in registers of x'bee pro S2 and x'bee S2C module?

We have been using X’bee pro S2 module for last 5-6 years, now it’s not available, instead we have to use its replacement X’bee S2C. Our existing embedded S/W has stopped recognizing ‘End device’ which we configure using X-ctu software from PC as end device & co-ordinator which is successful, but in changed scenario both modules are recognized by respective embedded s/w as co-ordinator & hence keep scanning for end devices interminably.
Pl. suggest which registers inside module IC, which bits have been modified/differ between two modules S2 & S2C so that we can correct the anomaly. You must be knowing something about IC in detail, don’t worry about our embedded s/w, we will correct it based on your info.