That IS what has happened after Pakistan was formed .What the hell man I'm just saying Pakistanis need to portray themselves as different than us, bas end of story!! As different as possible!! , whether you guys are homogenous or not is none of my concern! I only brought that up cause you called on Indian peoples are different which should be none of your concern.
Make a solid Pakistani identity very very different from ours so that no one bats an eyelid when trying to say what is Pakistani culture and make it known and popular, make it very very different from Indian culture, currently Westerners get confused!
That's what you want, Pakistanis want, indians want!!
Pakistan today is different from India in dress, languages, food and culture. We have a link language Urdu that has a rough similarity to Hindi ( as of today ) in a simplistic local form . As we form our identity there may be a case for replacing Urdu with Saraiki as a link language.
This may not be necessary because India will likely Sankritize Hindi further or more likely adopt Sanskrit as a national language.
Every nation needs a linguistic identity, Our linguistic identity will be complete.