Here are some studies confirming that many Muslims in northern India have (slightly) more foreign admixture than their Hindu counterparts (coming from Iran, Central Asia and Arabia):
https://www.ncbi.nlm.nih.gov/pubmed/20067368
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2859343/
This particular set of studies examines the Muslim Gujjars from near the border with Pakistan (but still in India) in comparison to the Hindu Gujjars, Jats, Ahirs and Rajputs that live in the same area. The results are quite fascinating, showing that the Muslim Gujjars differ significantly from the rest in terms of genetics as well as physical features, whereas the other groups are all more or less pretty similar genetically as well as in terms of physical features:
https://www.ncbi.nlm.nih.gov/pubmed/3163234
https://www.ncbi.nlm.nih.gov/pubmed/3812661
https://www.ncbi.nlm.nih.gov/pubmed/14524001
Here's an Indian newspaper discussing a study that confirms the Indo-European expansion into South Asia as well as the fact that the early Hindus discriminated against the natives of the Ganges, showing that high caste Hindus have higher amounts of European ancestry than low caste ones:
https://www.indiatoday.in/magazine/...cent-lower-castes-of-asians-773932-2001-07-30
This image explains itself:
More to come...
Muslims in India remain politically underrepresented. So much for 'Indian unity':
https://www.aljazeera.com/archive/2003/12/200849155257613162.html
IQ per country, Pakistan and Afghanistan are on par, with both nations boasting the highest IQ's in South Asia:
https://brainstats.com/average-iq-by-country.html
More Indians die from malnutrition (per capita) than Pakistanis, Afghans and Bangladeshis (individually, not all-together):
https://www.worldlifeexpectancy.com/cause-of-death/malnutrition/by-country/
Rate of suicide in India (again, per capita) is roughly 8x higher than that of Pakistan's (in fact, we have one of the lowest rates of suicide in the world), and the 2nd highest in South Asia (Sri Lanka trumps them by having a rate not only double that of India's, but also the highest in the world):
https://www.worldlifeexpectancy.com/cause-of-death/suicide/by-country/
Pakistan is the happiest country in South Asia:
India has a serious toilet problem, it accounts for 90% of public defecation in South Asia, roughly half of it's population publicly defecates, and about half of all the world's public defecators come from India:
https://www.sentinelassam.com/news/when-nature-calls-we-need-a-toilet/
Here's a rough map of greater Iran/the Iranian plateau, which shows that a significant portion of Pakistan is NOT part of the Indian sub-continent:
Most of the people living in this region of Pakistan also speak an Iranian language:
Gilgit-Baltistan has also traditionally been more under the sphere of Tibetan influence, being part of the historical Tibetan Empire:
Gilgit-Baltistan also shares much of it's mythology with the Tibetans, e.g the Epic of Gesar:
https://en.wikipedia.org/wiki/Epic_of_King_Gesar
The Balti language spoken in the region is also closely related to the Tibetan language:
http://www.nicolas-tournadre.net/wp-content/uploads/multimedia/2014-The_Tibetic_languages.pdf
Even among the Indo-Aryan people that Pakistan and India both share, the languages spoken belong to different sub-groups of the Indo-Aryan language family:
As one can clearly see, Indo-Aryan languages falling under the blue and pink sub-groups are the only Indo-Aryan language sub-groups present in Pakistan, and are almost completely absent in India.
Pakistani languages are also written in a Perso-Arabic script, which is completely different to the scripts used to write Indian languages:
Urdu script
Hindi script
Pakistani Punjabi and Indian Punjabi scripts compared
This is, however, in line with most of the Muslim world:
The only ethnic groups native to both Pakistan and India are Punjabis and Kashmiris. Even though these groups make up roughly 50% of Pakistan, they make up less than 3% of India. Even Muhajirs make up only (roughly) 7% of Pakistanis:
http://www.censusindia.gov.in/2011Census/Language-2011/Statement-1.pdf