Its far from impossible but it is HIGLY unlikely they are the same temperature. ALL, and I mean ALL temp sensors give an electronical reading which is sent to a chip which then tells you its reading this value, say 22, but it has to be programmed to tell you which means it has to set up incredibly well to assume it reads 100% accurately the temp of whatever it is taking the temp of.
Since your motherboard will be a different kettle of fish to your probes and are unlikely to ever give the same temp in the exact same environment, its safe to assume the CPU is being read incorrectly, but it is possible to get very low temps if you have a superb water cooling kit, it just means you have the CPU on a separate loop and on a PA120.3 Rad all to itself, thats the only way you are going to get damn near spot on room temp, and thats with a CPU with an extremely low TDP too.