Replace 250 gig drive with 160 Gig

I have an old Tivo 3 with the 250 Gig drive that has failed. I have a Tivo 3 160 Gig already programmed drive. Can I use the 160 Gig drive as programmed in the series 3 with the 250 Gig without changing anything on the drive? I know it sounds silly to go smaller but I have the drive and I don't need the extra room.