Most of the Doctors I have seen have diagnosed me with CRPS instead of RSD. CRPS (Complex Regional Pain Syndrome) is the "newer" term for RSD that Doctors tend to use nowadays.
When telling my friends or family about my illness, I usually call it RSD as it sounds more medical. To me, CRPS just sounds like the Doctors don't really know what is wrong so have just come up with a quick name for it. CRPS is sometimes easier to understand though!
RSD/CRPS type 1 doesn't have any nerve lesions
RSD/CRPS type 2 has evidence of obvious nerve damage.
I hope this has helped somewhat.