If it's USDM then yes it's a direct swap. The floor+defrost selection won't work but everything else will work fine; If you look at the pre89 control you'll see the option isn't there at all.
![Wink](images/smilies/wink.gif)
I can't remember what happens when you choose that one... naturally, the air blows through but I can't remember what vents it does come through.