Yes they are different.
In order from softest to hardest = red-yellow-blue (same as their touring car springs)
To be honest I don't think they're much good at all. Only the blues seem stiff enough to me - I personally run the black DF03 springs on my car most of the time, and those springs are now included with the Durga.
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Schumacher Cougar SV-Durango Dex410-Top Photon
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