It should be fairly obvious, the coloring should not affect the actual scales, they will still look healthy. If it is scale rot, I believe the scales will be affected and actually look as if they are deteriorating, not just a difference in color unless it is in a very early stage I suppose. Your best bet if you are worried would be to post an up close picture of the area and people here should be able to give you a definite answer. If I had to guess, if you can't tell, it's probably just the color but if in doubt post a picture.
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