Certain parts of Sindh and Punjab share some commonality with Hindustan. That is due to the border proximity. KPK and Baluchistan are a different story. They are different in every aspect. They are ethnically different. They speak different languages. KPK and Baluchistan are regions which share traits with Central Asia and other neighbouring countries.
Thank God, we're different nations and the border divides us. Anyone claiming that Pakistanis and Indians are similar need to have their heads re-examined. Pakistanis are ethnically a very diverse people. Something we are very proud of.
Typical average Indian
Typical average Pashtun
Typical average Baloch