Well that would explain it. Maybe ask a RR dB admin what happened to them.
And yes, the two dBs would be the same except the x36 dB is usually pulled about 24 hours after the HP dB, so it might have slightly updated info.
It looks like all the Sites are on RR with locations. My Sentinel is showing 4 Sites. It looks like they are all the Nye County sites. The Clark county sites are not there, but there is location info. You would have to ask a RR admin or UPMan to look into why the Clark Co sites are not there. I don't see anything obvious, but I might not be able to see all the settings. The system is defined as being in Clark and Nye Counties, and it appears all the sites have frequencies and coordinates.
Here is what was changed by RR on 12/21/14, and that appears to have messed up something:
Changed Site # 002 (Apex Peak (Las Vegas)) to 002 (Apex Peak (Las Vegas)) theaton 2014-12-21 21:39:59
Changed Site # 011 (Lake Las Vegas - Henderson) to 011 (Lake Las Vegas - Henderson) theaton 2014-12-21 21:37:21
Changed Site # 010 (Hacienda Hotel - Boulder City) to 010 (Hacienda Hotel - Boulder City) theaton 2014-12-21 21:32:18
Changed Site # 009 (Oatman Mountain, AZ - Laughlin Coverage) to 009 (Oatman Mountain, AZ - Laughlin Coverage) theaton 2014-12-21 21:31:09
Changed Site # 008 (Spirit Mountain - Searchlight) to 008 (Spirit Mountain - Searchlight) theaton 2014-12-21 21:29:45
Changed Site # 007 (Beacon Hill - Glendale) to 007 (Beacon Hill - Glendale) theaton 2014-12-21 21:28:44
Changed Site # 006 (Arden - Goodsprings) to 006 (Arden - Goodsprings) theaton 2014-12-21 21:27:31
Changed Site # 005 (SNWA Lake Mead Water Plant) to 005 (SNWA Lake Mead Water Plant) theaton 2014-12-21 21:25:34
Changed Site # 004 (NV Energy - Big Horn Plant - Primm) to 004 (NV Energy - Big Horn Plant - Primm) theaton 2014-12-21 21:22:14
Changed Site # 003 (Angel Peak (Mount Charleston)) to 003 (Angel Peak (Mount Charleston)) theaton 2014-12-21 21:20:34
Changed Site # 002 (Apex Peak (Las Vegas)) to 002 (Apex Peak (Las Vegas)) theaton 2014-12-21 21:18:55