this is indeed a difficult subject because historically architecture has been created having other architectures as point of departure. just think of how many "miesian" office towers there are out there obviously modelled on Mies van der Rohe Seagram Building or lesser known towers.
thus the discussion of plagiarism in architecture is a very difficult one. most of the time designing after someone's example is a sort of homage and it always involves some kind of adaptation to different circumstances pertaining to place, program and construction possibilities. this determines that in general any project is unique no matter how much it may have been inspired by another.
however, what we see in the images does not seem to be the same case. it seems as if the initial design has been taken forward by someone else without bothering to alter it in any significant way.
to discuss the matter in court is one possibility but it will certainly cost a lot and will probability drag on for a long time. the question for you is: is it worth the cost and the stress? are there precedents for this kind of lawsuit in your country? could you not approach the promoters and explain the case to them? perhaps you could reach some kind of settlement by which you get paid for your ideas.
just a couple of thoughts. good luck.
