I agree with Faeelin that the changes would be significant.
If the Chinese gain/retain a strong influence in that part of Central Asia, then this will almost certainly butterfly the Samanids away, and the Samanids played a *major* role in the formation of an Islamic Persian culture, as well as the propagation of Islam in Iran and among the Turkish peoples of Central Asia.
Muslim influence in Central Asia would be much weaker, and without large numbers of Islamized Turks in western Central Asia, the rise of the major Medieval Muslim Turkish empires like the Seljuk Empire and the Sultanate of Delhi would almost certainly be butterflied away.
ITTL, it is quite likely that the Muslims never make it into the heartlands of India, and they might not even manage to bring eastern Afghanistan under their control - there was a Hindu dynasty (IIRC the Shahi dynasty) that controlled parts of eastern Afghanistan until the 11th century, and they were only driven out by the Ghaznavids, who were a Muslim Turkish dynasty that would almost certainly be butterflied away if Islam never really spreads among the Turkish peoples of southwestern Central Asia...