I don't know of every precise difference but I suspect substituting a non-original turbo for a turbo that was designed for optimal performance as part of a highly engineered drivability package that these cars are would perform at non-optimal levels even if it could be physically accomplished.

As far as being detrimental to the engine, possibly not but functionally probably so.

I have no reason to argue I was merely pointing out the obvious differences to anyone who was thinking such a move was a direct swap.