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The wire color does not mean much in most cases, as long as the wire goes to the same place as the working furnace wire does, it is correctly wired... if it has been working properly earlier wired the way it is, then it is also properly wired.
If the wire connection is tight, and the flame sensor is not working, first step is to clean the flame sensor rod off with plumbers sand cloth or a pot scrubber pad... if that fails, the next suspect is a bad printed circuit board.
Tell me a lot about your technical skills sets and I will be able to coach you from there most effectively.