Can you use these with the PMDG 737 as well as the Fenix A320?
Yes you can. You can use any gaming peripheral with any aircraft, but some configuring and remapping of the axis’ and buttons is required. How much or how little depends on the aircraft.
There are many tutorials on youtube on how to create separate profiles, and tailor them to a specific aircraft, PMDG 737 and Fenix A320 included. Google is your friend. 
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