Since when does Pakistan only consist of Punjabis and Sindhis? What Pakistan do you come from? Are you sure you're on the right side of Kashmir?
I really can't be asked to go into detail about this but i'll try keep it brief.
Punjabi and Sindhi are the only ones who have things in common with Indians i.e language/culturally/wedding customs/food. They love referring to each other as desi people hence making it seem to outsiders that all Pakistani group are similar to Indians when we all know this is not the case.
Neelam Valley is in Pakistan and my family have always resided there. I've lived here in the U.K and its always Punjabi/Sindhi connecting us with Indians when we are so different and it bugs the hell out of me. From my experience Punjabi/Sindhi culture are extremely liberal when you compare them to the rest of Pak. Where i live Pakistani punjabi and sindhi would marry within Indians and still be accepted within their respective communities whereas the rest would get disowned when marrying within Indians.
Apart from Punjabi and Sindhi in U.K we have Pashtun, small amount of Kashmiris and a large Mirpuri community. The three latter ones marry heavily within their own sub groups and marrying an Indian would either lead to honour killings or disowning of the guy/girl involved from her family regardless of religion. Thankfully for me and my family who reside in B'ham we live with a large Mirpuri community who hardly get on with Indians and would definetely never think about marrying within Indians and so these rubs onto the rest of the Pakistani community who wouldn't dare take Indian as partners in a relationship.
Unfortunately thou the case of my Pakistani punjabi friends is different as many have Hindu/ Sikh friends and go to their 'Desi' functions which will lead to them hanging out with a Indian boys/girls with a view of even marrying them and i've seen around five cases where they have been happily accepted into the Pakistani punjabi/sindhi family which would never happen with other communties from PAK.
I just can't comprehend how a Pakistani could consider a Indian girl/guy over a Pakistani when i believe we are better looking, more modest, polite and generally both Pakistani men n women get along very well with each other. If your a coconut and do marry out of your race, just make sure its not INDIANS.