Do usetup.exe & smss.exe mirror

I need some help. A noobe to resource editor, I've been comparing usetup.and smss.exe with resource editor, and I would swear they are the same file.

So, do usetup.exe & smss.exe mirror each other?

Something was accidently changed in usetup and not sure what it was, and I'm hoping I can copy smss and write over the mistake to get my usetup back.

It truly was an accident, my wife's new kitten jumped on the keyboard before I could stop him.

If I have to, I'll copy the file again from the cd, and go thru the hassle of uncompressing, but I'd just like to be able to cut& paste if I can.

Thanks