I believe the fundamental swings of tee shots and irons shots are close to the same, as far as the motions, but I also believe the Driver swing should have a flatter bottom or wider approach to impact then an iron swing. I like to use the correlation of the iron swing to the letter V and a tee shot swing to the letter U or even wider.
The iron swing should be descending down and through the ball and a tee shot swing should ideally be reaching impact on a slightly upward motion. Sometimes I will not stress the upward notion to a student who has issues with trying to help the ball up but this is a great thought for the better player.
I have always been a big fan of the wider bottom of the swing and from my view some of the greatest ball strikers over the years had the greatest width or swung the club down the target line the longest.