i dont think they are the same, however i know i have a couple in the garage will have a look tomoz for u guys.
edit: Ive got 5 of them here, the bolt holes are offset where it goes on the chassis, so there is no way left and right are interchangable, moreso, im not even sure what ones i have, as my cars not here to look at. There are numbers 1 & 2 on the hinges also, so id assume upper and lower are also a little different.