They are the same doors and are steel. The only impreza panel made in ally are the bonnets on sti and p1 in classics, it was I believe and option o the wrx and ally on ra.
The doors are lighter as they have no central locking motors or window motors.
The glass thickness has never been proven to my knowledge either.
Spec c deffo has a thinner front screen but thats newage and the only different glass thickness I am 100% aware of and seen proof for.
Simon
Simon
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