If there are processes with the same name - like in WinCC OA if you have more than one control managers running - PerfMon (Windows Performance Monitor) will display a nr with a hashtag <ProcessName>#1 <ProcessName>#2. But there is no relationship to the Process-Id (PID) you see in the task manager...

This can be changed by adding a registry key:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\PerfProc\Performance

ProcessNameFormat => 2

Value => 1: no Process-Id (default)
Value => 2: display Process-Id