McQueen and Rodarte are absolutely two of the most important brands of our epoque. Both have an avant-garde and peculiar style that, sometimes, could be exaggerate and sometimes so lovely. In general, these two brands have different styles that have nothing in common.
However, in this case we can see a general concept that is shared by these two models. These wedges are amazing by a fashion point of view. In fact, the "constructed-heel" in a baroque and opulent style gives to the entire wedges an innovative appeal that makes these shoes unique in their style. The main feature of Rodarte wedges is the decoration on the silk and the use of wood: wood is the theme on which Rodarte’s s/s show was developed. Alexander McQueen, or better Sarah Burton, decides to use flowers (white, gold or black) as a heel. The general aesthetic is baroque, with some touches of a "gothic-romanticism" for McQueen and "Kirkwood's ones" for Rodarte.
So, I don't think that we can speak of a "copy" but it’s better speaking about a common inspiration, a "small trend".
I love the idea (that is characterizing the contemporary heels) to consider the heels as a “beautiful part” of the shoes and not simply a support for the overall accessory. In this way, the creativity, and so the designer, has more freedom and could create this art pieces.