I'm going to use either a RB750 or 750G configured as a switch behind a non-Mikrotik router. I'm curious whether I can use the NTP Server and Client package on the 750's even when they are NOT configured as a router?

Thank you!

Each switch group you configure also has CPU-port, so there shouldn't be any problems to run NTP features on your Routerboards.
More information: http://wiki.mikrotik.com/wiki/Manual:Sw ... p_Features