I just wonder how many last minute conversions there were in the immediate pre-partition and post partition period that helped maintain the privileges of land ownership? The Punjabis who converted were surely the most vociferous supporters of Pakistan and Islam in public, but were followers of "syncretic" Punjabi culture otherwise. That is what allowed intermingling of Hindu/Sikhs and Punjabi converts. I recall reading that Sikhs will not eat/are not supposed to eat halal meat (*). I don't know how far that is true, but this problem was resolved culturally because Sikh food in Gurudwara functions was vegetarian.
The people who ventured out of their "Homeland" were hurt most., i.e. people living around Rawalpindi were among Pathans (Punjabis vs Pathans). Rawalpindi riots started in February - March of 1947 and continued till August-September. Then Bahawalpur (southern) was a separate state whom Nawab declared Massacre against non-muslims and even used Baluchi soldiers to loot them., many people saved themselves by converting.
Villages around Lahore/Sialkote/Lyallpur/Sargodha/Gujranwala were/are of the people who were of essentially same families (not anymore due to inbreeding). i.e.
for example a person living at Amritsar converted during Aurungzeb rule to get a "Jagir" for his economic betterment., let's say his last name was Sethi. He maintained his "Biradari" relations as his elders gave him rights to the property (land/house/etc)., and so did his successive generations. He helped his both muslims and non-muslim family so that they became a "land owning Jagirdars". During partition the muslim part of this family was most likely helped by their "Biradari" to cross the border and they probably took over the land/house/cattle/etc that was left behind.
Regarding Jhatka meat!! Beef eating phenomenon is a very recent one in naPakistan. Earlier Muslims never ate Beef!! Sahib Singh Bhangi (who was ruling Lahore) had enforced a writ that a person caught with Beef would be executed and he executed many. Ranjit Singh also enforced this rule. , Baba Ram Singh Namdhari (1850s) actually murdered any Muslim butcher who was accused of selling beef anywhere in Punjab (Lahore to Patiala at that time)., he was executed for that.
Jats have very unique customs
1. Worship of their ancestors (Sikhs, Muslims and Hindus all used to do this) Samadhi or Kabr.
2. Drinking home brewed alcohol (not sure whether Muslims still do it) but Making alcohol out of Sugarcane is a custom much older than Sikhism (Guru Gobind singh forbade Sikhs to drink alcohol)
3. When a very old person passes away we celebrate his long life., it is called "Ekath" or "gathering". It is a bigger ceremony than a marriage and with much larger gathering. With music, alcohol and Goat meat (Bakra). Any Happy Jat ceremony is not complete without Bakra(Male Goat Meat) and Alcohol. Muslim Jats would usually give away "alive Goats" along with dry rations to their Sikh/Hindu Biradari.
The vegetarian langar is a recent phenomenon as earlier Jhatka Goat Meat was served (and it still is served at Nanded (Maharashtra) and Patna (Bihar)) calling it "Maha Prasad" .