From experience. YVR - HKG. and HKG - PEK. on separate PNR they did tag my bags thru to PEK. and I had a delay out of YVR and missed my PEK but as I arrived to HKG they had an agent waiting for me by the gate with a new BP and escorted me to the new gate.
so you should be ok even if you miss your first flight as CX is pretty good as putting you onto the next flight out to PVG.
