What's the difference between printbrm.exe and PrintUIEntry

As we know, we can save something of printers by

rundll32 printui.dll,PrintUIEntry /n M126 /Ss /a "D:\1.dat"

or

printbrm.exe  /b /f D:\

.

Of course, I know that the one is calling an exe with arg from cmd, the other is that a process loadlibrary the dll and call the function.

I don't know what's the difference between the files which they save. such as D:\1.dat between D:\1.printerExport.

In fact, I know little about printers.