When monitoring "CPU" utilization of an "Application" within APM 2.0. I may see the "Application" using 100% of CPU however the "server" CPU is not registering 100%. Is this a false reading?
Orion core is taking the CPU measures via SNMP and is getting an average across 9 minutes (or whatever your polling interval is for nodes), while APM is checking each process every 5 minutes, and it's measuring the CPU usage of that process/service in a smaller interval.
So you might see different results because of variability in timing.