These are definitely not duplicates of an existing object; it's merely that the performance counter instances exposed by SQLAnywhere happen to appear to be filed under that performance object type by Perfmon.
If you're determined to suppress the SQLAnywhere performance counters even though there is really nothing to be gained from doing so, you can do this by removing the associated registry keys which register the SQLAnywhere performance DLL for client applications like Perfmon to load: see http://support.microsoft.com/kb/152513 to learn how Perfmon works.
Specifically, Performance Counter extension DLLs are registered under registry paths of this form:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\service name\Performance
If you remove the entry corresponding to the SQLAnywhere product, then you should be able to prevent Perfmon loading the client extension and seeing those counters.