Are /RegServer and /RegSvr the same or different, if different why/how?

For example I have seen (example from a 32-bit OS) this style:

RegSvr32 COM.exe

or 

RegSvr32 COM.dll

Or as an alternative (which was on a 64-bit OS):

COM.exe /RegServer
COM.exe /RegSvr

Are these different approaches doing the same thing?

com registration
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