There is a machlokes between Rav & Shmuel on the Pasuk Vayokom Melech Chodosh
One holds that there was a new king. The other holds it was the same king with
new decrees. (Gezeiros)
The Toras Chaim writes this machloke makes a Nafka Minei (difference) Lahalacha.
If someone sells a newly renovated house as a brand new house, do we consider
it is a legal sale.
Another Nafka Minei Lahalacha , If someone renovates his home, does he
get sent back from going to war.