The 2 coils are 6 volt coils wired in series at 12 volts so each coil has its full required current and voltage so each plug gets the same energy and all that is required. Due to LV primary resistance, coil current, and LV to HV turns ratios the spark in each is about the same or near as much or the same as if it was a 12 volt coil.
The 2 coils are autotransformers same as an auto coil and NOT a loss spark coil.
Once coils HV output will be POS ground the others NEG ground and the common point in the autotransformer configuration is in the center where the 2 coils join therefore they are at opposite polarities with respect to frame ground.
This may or may not help but absent the coils internal wiring configuration this is the best I can do. I say each plug has the same spark energy as if it were a 6 volt coil on a 6 volt tractor which is the same if it were a single 12 volt coil on a 12 volt tractor.
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