There is no historical existence of India, India is an OLD ENGLISH term, which got its name from Sindu river or Indus.
Looking at Pakistanis of Punjab, Sindh or Kashmirs (except small part of Indian Punjab & Kashmir), there is no resemblance, there is no match, no link. Its evidence today, if there was I would have said it look Indians and Pakistan are have same feature, same personality traits, same methods, same genes, but the greatest evidence of all to refute and reject your claim, is looking at TODAY.
A Pakistani and Indian, anyone can easily know, whose who.