No...Pakistan will not send troops. If there is a shooting fight between the US and China, China will lose control of the air, which is crucial in modern warfare. And please do not bring up Afghanistan...
...The PLA is a formal army and the US does not want to invade mainland China. So the Afghanistan argument is already trashed. That mean it will be Chinese troops who will fight alongside NKR under no air cover. The US-led alliance does not need to cross the 38th, just hold it so the three air forces can pound the China-NKR armies. Eventually China will need to make a decision on whether to escalate the war to nuclear or to withdraw and let the abomination called North Korea perish.
Money? South Korea and Japan got plenty to contribute. Will Pakistan send money to China?