É o mesmo comando, então não há diferença.
Se você quis dizer: o que as opções significam: o manual explica isso assim:
Options
-display disp
X11 server display to connect to, usually :0. The X server process must be running on same machine and support MIT-SHM. Equivalent to setting the DISPLAY environment variable to disp.
-auth file
Set the X authority file to be file, equivalent to setting the XAUTHORITY environment variable to file before startup. Same as
-xauth file
. See xsecurity(7) , xauth(1) man pages for more info.
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