On alldata it states two different fluid for rear diff, should they be mixed?

Hey, my name is Dusty and I'm one of the auto experts with RepairPal's Car Genius team here to help! Mixing fluids is in general, not advisable unless there are explicit instructions from the manufacturer. Looking over the documentation in AllData as you did, there are two separate drain & fill procedures that will need to be followed. One is for the rear differential, at least the traditional portion of the rear differential. The second is for the Differential Clutch Oil, which is mated to the rear differential and will require a system bleed after replacing the fluid. Which will require a diagnostic device capable of performing the 'Rear Differential Hydraulic System Service Bleed' in the Rear Differential Clutch Control Module. If you have any other questions or would like help with finding a RepairPal Certified shop in your area, give us a call! 877-913-1554