The inner tie rod ends are different between the RWD and AWD, and are included with the rack assembly.The part numbers seem the same for both the AWD and RWD racks, which make sense that the part would be the same for both versions. So I would just go with a rack from a RWD car and just reuse the specific mounting brackets and hardware that your AWD car may need. However, I would take a very good look at the parts to ensure that it is interchangable from rack to rack.
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Note: I think that the part site information could be wrong. The 2015 5.0 RWD model has a similar looking rack with a different part number ending with B1200 not B1400 like the 3.8 listing. However, both the 5.0 AWD and RWD racks have the same park numbers ending in B1200; so maybe the 3.8 part numbers are correct. Weird.
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OEM Inner tie rod ends for RWD were impossible to find some years ago, hopefully they are available again and if not, aftermarket is available.