It's not 100% to say which is softest/hardest, as there are essentially 2 diffrent types of rubber mix. Not all tyres are available in all compounds either.
I would say the order is (from soft) Silver, Green, Yellow, Blue.
Silver and Green are similar rubber types, Yellow and Blue are similar.
Hope this makes some kind of sense.
Edit: Looks like the Silver compound is no longer made.
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