Both upgrades in this case are EASA Minor changes. No STC required as there are no failure conditions associated with the new kit that are hazardous or catestrophic and no changes to certified gross weight, C of G limits or aerodynamics (there are a few more considerations but none apply in this case).
Once EASA CS-STAN is adopted (possibly next year) then the licensed engineer or Part 145 organisation will be able to cover the change without a formal modification approval, just like an FAA minor alteration. For the time being, approved data is required as the part numbers are changing and additional functionality is being added.