Play fair, because this design is already done, same color and arrow style which could not be a coincidence..so my advice would be withdraw your entry..if contest holder doesnt have any problem after watching that design then i see no problem that. we are just stating the obvious here not trolling.
Haters will hate. Please try and WIN some of your own contests and stop pointing out at others work. I have seen that design for the first time now as you just did, It is possible for me to think of a design which is not already been designed by the rest of the 6,775,235,700 People? Come one some of them do clash in these kind of concepts, If i really wanted to copy i would literally have, But i have a thinking and i know Illustrator, So why wouldn't i do my ORIGINAL WORK? I know even you might have thought "he did not copy it but still the design looks same and i did not win this one so lets ruin his life too." Please stop and Move ON.