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The first one moves the driveshaft slightly b/c it adjusts camber by moving the front of the rear subframe up or down slightly, but the difference to the driveshaft is negligible unless you go for -5* in back or more. The front of the rear diff is the only bit mounted to the subframe; the rear is to the chassis, making the difference even smaller.
However, the second pair you show is the better buy since you can adjust each side independently instead of both at once to better match the two sides. It doesnt matter which one goes on which side, just that the black end is bolted onto the inside pivot point of the rear A-arm and the gold end is bolted onto the chassis. This is replacing the dogbone link that is there stock; its a metal piece on S4's and plastic on S5's. Theres no reason why its not safe to use, most of the load from the swing arm does not pass through it anyway so theres little chance of it breaking (which is why mazda could use plastic on the S5's).
If you dont want to use them, sell them to me :D
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