I have done both of these tours. And I have done two sets of back to back tours. I just have not done these two tours back to back.
But as stated by others a great way to get value out of that plane ticket.
In reviewing the tour dates for both I have found several possibilities.
If you take the South Italy on 10/8/18 you have two good choices for the Village Italy tour.
The 9/22/18 Village Italy ends on a Friday and South Italy begins on the following Monday. Also the
9/24/18 Village Italy ends on Sunday AM with South Italy beginning on Monday 10/8/18. So it will depend on how much time you want between tours. The 9/22 Village Italy would allow travel to Rome on Friday. Then you would have Saturday, Sunday and most of Monday for Rome or other stops along the way. The 9/24/18 Village Italy would allow Sunday for Travel to Rome and most of Monday for rest before the 4 PM Monday meet the group gathering. The other Village Italy tours in Sept end on Sunday and the South Italy begin on Monday. So it depends on how much time you would like between the tours..
Oh yes, both are great tours for seeing the other side of Italy.