I reckon this will work just fine. What's critical with the 5HPs is final drive ratio, as the internals are all the same. The TCU is programmed to know what rpm should be coming out relative to gear selected and rpm coming in. If you have the same final drive between the two (which you do) the TCU will never know the difference.
ECZ transmission goes with DUR & EUS final drive 3.7:1
FUL transmission goes with EUS & GME final drive 3.7:1
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