Well I was feeling brave today and went ahead and scheduled it at the RTP_m location and when I got the confirmation it says the lab location is:
Cisco Systems, RTP Office
7025 Kit Creek Road
Research Triangle Park, NC 27709
Same as the Research Triangle Park location. Weird that they have both options and stranger still that they have different dates available. I dunno...
The labs shown as "_m" (For example, "RTP_m") are just seats that have been temporarily added to the stationary/fixed lab location. So for example, if a candidate schedules a lab exam shown as "RTP_m" then this lab exam will be hosted in the very same stationary location for RTP (Research Triangle Park). Per the lab exam confirmation information that you posted, this shows it to be in the same location
I hope this helps.
Cisco Learning Network Moderator