Perfmon Thread Count vs SQL Workers

We are trying to monitor SQL Worker Threads and in the past we used the following query: SELECT SUM(current_workers_count) as [Current worker thread] FROM sys.dm_os_schedulers We are now considering just using the PerfMon counter “Process>Thread Count” for each SQL Server Instance. During our analysis, we noticed that there is a slight difference between the PerfMon Thread Count and the Worker Threads as found in dm_os_schedulers or dm_os_workers. We also compared it to what was found in dm_os_threads and still saw a difference. Does anyone know the difference between what is being tracked in those Microsoft provided DMV’s vs what is being captured by PerfMon? The DMV’s are consistently lower than what is found in the Performance Monitor, so they must be "excluding" something. We need to understand what that something is. For example, the dm_os_threads dmv will show 137 but the perfmon counter will show 141 and the dm_os_scheduler and dm_os_workerss dmv's will show 122 and 123 respectively. We are on SQL Server 2017, CU22; Windows Server 2016