Quoted from phishrace:
All 5 flipper coils should be A-17875, as it says on page 18 of the manual.
The two coils the OP mentioned are interchangeable as I understand. I'm actually considering swapping the lower 17875 out in my genie and replacing with 20095s.
Wadwerks, if you decide to put in the 20095s, can you let me know how the game plays?