I don't see any Sino-Indian war anytime soon. China is just flexing its muscles and this tactic will force India to focus on two fronts all the time rather then only one.
Many people in Pakistan know that India is upto something in Kashmir and may attack GB to try cutting CPEC link with the blessings of its allies in the west. There's a possibility that due to numerical advantage, India may disrupt the link. The biggest help Pakistan wants in this war from any country is to somehow reduce the imbalance. This border dispute between India and China at this point in time refers to one thing, and that is: China is helping Pakistan by forcing India to stretch towards north east and thus become thinner on the western border. India has started doing the same by using proxies stationed in Iran and Afghanistan. However, imo, Pakistan can manage from here.