Since the 924v Air charges the fasted due to being the highest voltage EV, will the 756v Airs charge slower? I understand the 20% to 80% miles range (260 miles) is different.
The voltage is based on the source side. When you are driving, the source is the battery and it will produce a max of 756 volts. When connected to a fast charger, you will get whatever the fast charger provides. It will be ~900v whether you have a GT or pure.