What I want to know is why someone would go through all the trouble to install such a socket? Removing a mobo from the case, de-soldering the old socket, installing a new socket where two pins need to go to Gary anyway... unless you wanted to show off some damn fine soldering techniques! lol
I would have just put the new socket into the old piggyback style! And yes, the contact between the two would be just fine.
-edit-
Oh, I see other links showing alternative methods now. Still, instead of soldering directly to the Kickstart chip, best to just double up the sockets to be on the safe side, unless some other hardware in your machine would prohibit that somehow.