If you look up the clutch from any parts store ie Mazda trix you will find out that both cars use the same clutch there for your spline question would be moot, as for the tranny question they are interchangeable the only issue you will see could be related to rear end gear ratio as some SEs have a different ratio than the 12a cars, You do not need to change the flywheel of your engine because you are using this tranny.
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