The problem of Kashmir is there from day one of India's independence. Had it not been for the swift action of Indian army, Pakistan would have occupied Kashmir. Timely intervention saved it from the occupation of Pakistan. The majority of the people there are Muslims whereas the ruler was Hindu who opted to be part of India. The people do not seem to be in favour of continuing as part of India. A major portion of Kashmir has already been occupied by Pakistan.
There is no problem of land issue in Arunachal Pradesh. However, China claims that state as part ot its territory which is totally wrong and baseless.
China has grabbed Tibet and is trying to grab territories of most of its neighbours.
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Different! Both are integral part of India! Kashmir was acceded to India by an Agreement between Raja Hari Sigh and India immediately after Independence of India! But Arunachal Pradesh is within the territory od India before independence itself!