The cruise control "brain" is elsewhere. The only thing in the wheel is the CC switch (that stalk sticking out) which plugs into harness behind the airbag. Then there is a harness for the airbag too. The only concern is you will have to reuse the CC stalk from your OBS wheel in the new wheel. There is instructions over on scoobymods for a WRX into an RS swap.
You may want to think about doing a v6 or v7 wheel instead of a WRX wheel. Much nicer IMHO.
EDIT: Dang it...beat me too it.