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There are some variations , I think the later EV's have a slightly wider swingarm . The experts will weigh in shortly . Dusty
The swingarms are all the same width at the pivot point, so yes, they are interchangeable. I believe the newer frames are wider, as are the shock mounts, not but much though and doable. The latest 03/04 style Tonti swingarm uses a different pivot pin ( different diameter threads and it`s not a direct swap without changing out bearings and modifying the pin length. The pin length is too long from an early tonti due to the shallower swingarm bearing recess on the right side of the swingarm. Recently modified pins to mount an 04 swingarm to fit my t3 type chassis to run a wider tire and rim. Also mounted the long Cal 3 / Jackal style swingarm to a Lemans 1000 , that was a more direct swap with the same bearings and pivot pin. With either of these conversions, the shock will lay down at a much lower angle, dropping the rear height as well as changing the spring rate action.
The swingarms are all the same width at the pivot point, so yes, they are interchangeable. I believe the newer frames are wider, as are the shock mounts, not but much though and doable. The latest 03/04 style Tonti swingarm uses a different pivot pin...
what 5154 said, and please for gods sake do not try and move an upper shock mount. Buy a shock of the proper length to give you the geometry you want.