RazorLame IS the "real" LAME...
You already HAVE LAME 3.92 (or some other version), since RazorLame cannot do anything if you don't have LAME.
You can see what version of LAME you have by clicking Actions -> View Last Log.
If you want to have absolute control over the LAME options you use, at the LAME Configuration panel choose "Expert" mode (I think it's called expert, or maybe "Advanced"), this is a checkbox and if you check it it causes RazorLame to ignore **ALL** options except those you specify in the "Expert" text field.
This is the same as running LAME from the command line, only much prettier!
If you have the latest version of RazorLame, the options it uses are shown at the status bar at the bottom of the window. This way you can easily see what command line switches you use.
For the latest version of RazorLame, see
http://www.dors.de/razorlame
For the latest Windows compiled LAME executables, one of the most "official" sites is Mitiok's page:
http://mitiok.cjb.net
Mitiok's compiles are considered to be as "official" as any compile you can find.
I hope I helped!
cya
PJ